Mathematics Middle School

Karl can clean a room in 3 hours. If his little sister Kyra helps, they can clean it in 2.4 hours. How long would it take Kyra to do the job alone?


plz help

Answers

Answer 1

Answer:

1 hour and 25 mins

Step-by-step explanation:

divide 3 and 2.4 which equals to 1.25

Answer 2

The amount of time required by Kyra to do the job alone is 12 hours.

What is an expression?

Expression in maths is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication, and division.

Numbers (constants), variables, operations, functions, brackets, punctuation, and grouping can all be represented by mathematical symbols, which can also be used to indicate the logical syntax's order of operations and other features.

Given that Karl can clean a room in 3 hours. If his little sister Kyra helps, they can clean it in 2.4 hours.

The time will be calculated as below:-

( 1 / 3 ) + ( 1 / t) = ( 1 / 2.4 )

t = ( 3 x 2.4 ) / 0.6

t = 12 hours

Therefore, the amount of time required by Kyra to do the job alone is 12 hours.

To know more about an expression follow

https://brainly.com/question/4458732

#SPJ2

Related Questions

A coaster is designed to hold 2 different drinks. Find the are of the coaster. Round your answer to the nearest hundredth.

Answers

Answer:

You will save points if you try to solve it urself first Lol

22.065

Explanation: 5x3=15

A=1.5x1.5x3.14

2.25x3.14

7.065

15

——————-

22.065in2

Answer 22 in rounded or 22.065 in
Area of a rectangle is 5 x 3 = 15 in
Area of the circles is 3.14 x 1.5 x 2 =7.065
Finally 7.065 + 15 = 22.065 squared in

Write the sentence as an equation.

38 less than the quantity f times 235 equals 44

Answers

Answer:

235(f - 38) = 44

Answer: f (235) - 38 = 44

The swimming pool is opened 8 hours a day the pool manager must divide pool time equally among 5 groups; camp, camp swim team, swim lessons, family swim, and open swim how much time should she allow for each group?

Answers

Answer:

1.6 hours for each group

Step-by-step explanation:

8 / 5 = 1.6

1.6 x 5 = 8

you have to share 8 hours equally among 5 groups so its just 8 / 5 and you get 1.6 and thats how many hours each team is going to get

i got an answer but im really not sure if its right so please help

Answers

Answer:

60 degrees.

Step-by-step explanation:

Since you know that y = 74 because they are vertical angles, and 46 = the angle across from it (there is a theorem for it). Since one line is 180 degrees, and you already know the two sides next to x, which is 74 and 46, you can do 180 - 74 - 46. Your final answer should be 60 degrees.

Answer:

60°

Step-by-step explanation:

so we need to find x

we are given 2 angles 46° and 74° which is in the middle of those numbers.

add 46° + 74° = 120°

since a straight line is 180° subtract 180° by 120° to get 60° = x.

Your family packs a cooler with snacks and drinks for the trip, but stops for two meals on the way. If there are 4 people in your family, and each person spends 6.50 on each meal, what is the total cost of meals on the way to Arizona?

Answers

answer: $52.00

work:
4 people
$6.50 per person
2 times

so 4(6.50) = $26.00

that means one time that they went to eat was $26

but since they went twice, multiply that by two to get $52.00

Answer:

52

Step-by-step explanation:

4x 6.5= 26

26 x 2 = 52

what is 130000000000000000 x 2345

Answers

3.0485e+18. That is the answer
That’s not possible I think

9x + 9x − 21 = 33

Please solve for x C:

Answers

Answer:

x = 3

Step-by-step explanation:

Combine like terms

18x - 21 = 33

add 21 to both sides

18x = 54

divide both sides by 18

x=3

X=3 hope this helps :)

1. At a bake sale, a dozen cookies sold for $4. This price was 80% of the original price. What was the original price?
If 12 cookies are for $4

Answers

Answer : Original price $5
Equation 80%/100% $4/?
1) Multiply 100 by 4 which gives you 400
2) divide 400 by 80 which gives you 5
Turn 5 into $5
Answer above is correct i checked it its 5 dollars

The frequency table shows the results of a fair number cube rolled 40 times.

Face Frequency
1 5
2 9
3 2
4 8
5 12
6 4
Find the experimental probability of not rolling a 6.

Answers

Answer:

11/12 ratio for not rolling a six.

Step-by-step explanation:

There are 12 numbers and only 1 time of the 12 did they roll a 6.

11/12 theres only 12 numbers and u need 1 theres a 1 in 12 chance and just subtract 1 from 12 and theres your answer 1/11 chance

helppppp please i reallly need it

Answers

Answer:

a. a

b. c

Step-by-step explanation:

a. 7(7 + 2)

49 + 14

b. 3(8 - 5)

24 - 15

I believe that the answer is B

A rectangle is 1/2 feet long and 3/4 feet wide.



What is the area of the rectangle?



Enter your answer as a fraction in simplest form by filling in the boxes

Answers

Answer:

The answer is 3/8ft^2

Step-by-step explanation:

Hope this helped and have a great day!

1/2= 0.5
3/4=0.75




so after you have them in decimal form you can multiply them, to get 0.375.



0.375 as a fraction in simplest form is 3/8



sorry if this is wrong

Which of the graphs is the best example of a line of best fit?

Answers

A; scatter plot shows that
A is the answer to the question

You go to a local ice cream shop to get a sundae. You can choose from mint n' chip or strawberry or cookie dough or neapolitan ice cream, chocolate or caramel sauce
drizzle, and Crunch bar or Butterfinger or brownie mixed in. If a sundae is created at random, what is the probability that it's strawberry ice cream, mixed with Crunch bar
drizzled with caramel sauce? Write your answer as a simplified fraction.
1
12
1
30
1
24
h

Answers

Answer:

1/12

Step-by-step explanation:

1/2 is the answer hope that helps

Someone please help ASAP, will give BRAINLIEST to someone who actually gives a accurate answer

Answers

Answer:

its 49 hope i helped you god bless

Step-by-step explanation:

Will give brainliest!! Using the measurements of the shapes.. determine the area and perimeter of the irregular polygon.

Answers

Answer:

[tex]p=28.2\:\text{units},\\A=40.2\:\text{square units}}[/tex]

Step-by-step explanation:

The irregular shape's area consists of the sum of the areas of all the shapes that make it up.

Area of pink triangle: [tex]\frac{1}{2}\cdot 3 \cdot 3=4.5[/tex]

Area of purple square: [tex]3^2=9[/tex]

Area of green quadrilateral: [tex]3\cdot 2.9=8.7[/tex]

Area of blue triangle: [tex]\sqrt{10.25(10.25-8.5)(10.25-6)(10.25-6)}=17.99989[/tex]

Therefore, the area of the irregular polygon is [tex]4.5+9+8.7+17.99989\approx \boxed{40.2\:\text{square units}}[/tex].

The perimeter of the irregular polygon consists of certain shred sides from the four polygons that make up:

[tex]p=3+3+3+4.2+3+6+6=\boxed{28.2\:\text{units}}[/tex]

Help me please! Somebody!

Answers

Answer:

the first or the second or the 3

Step-by-step explanation:

3. 3 1/4. 3 1/2. 3 3/4. 4. 4 1/4. 4 1/2. 4 3/4
3. 3 1/8. 3 1/4. 3 3/8. 3 1/2. 3 3/4. 3 7/8. 4
0. 1/2. 1. 1 1/2. 2. 2 1/2. 3. 3 1/2. 4. 4 1/2. 5

original price: $32 discount: 16% sale price: ?

Answers

Answer:

£26.88

Step-by-step explanation:

16% of £32 = £5.12

 32.00

- 05.12

-------------

  26.00

26:88 .....................

Which statement about the employees is supported by the data in the bar graph?

Answers

D is the answer. 45 employees in category 1, 15 in category 3.

Answer:

A

Step-by-step explanation:

If u look at the diagram you will see that A is a more suitable answer because there is more than half the category in I

Guys, I really need help with this!!!!!

Answers

4 is 18 because 6x3 is 18
Answer to number 5 is 16

Needing help on this?

Answers

Answer:

9/10-0.9-90%

The Explanation

9÷10= 0.9

0.9=90%

0.5 (7d+4) = 7 - 1.5d

Answers

0.5 times 7d equals 3.5d and 4 times 0.5 equals 2

3.5d+2= 7-1.5d

Then add the 1.5d to 3.5d, subtract the 2 to the 7

5d= 5

Divide the five from 5d to 5

d= 1

An aircraft flies 80km due north. Then it flies 72 due west. Calculate how far the aircraft would have travelled if it had travelled directly from its starting point to its destination

Answers

Answer:

i cant be you a sorry your answer my question

Total destination will be:
80 + 72 = 152 km

please help with this anyone

Answers

You distribute the 4 to both x and 5. 4 times x is 4x and 4 times 5 is 20. Divide both sides by 4. X=5

A net has a square at the center and 4 triangles on the sides. The square has side lengths of 2 yards. The triangles have a base of 2 yards and a height of 3 yards.
What is the surface area of the square pyramid?

The surface area is
yd2.
Please Hurry! NO SPAM

Answers

Answer is 48 I’m not sure but that’s what I got!

Answer:

It's 16

Step-by-step explanation:

Sorry it's late, but I just did it and hope it may help someone else :)

6. There are 16,709 planks on the rope bridge. If Horton crosses 7,012 planks before the bridge starts to break, how many planks are left?

Answers

Answer:

9697

Step-by-step explanation:

16,709-7012=9697

The answer is:9,697 I did I the math in my head lol

Help ASAP with an explanation

Answers

Answer:

I belive its B

Step-by-step explanation:

It’s B

(I don’t really understand it but I JUST HAD THAT QUESTION on my hw)

Hello people I need help with this thanks

Answers

The correct answer is 320

Help ! im giving good reviews to good answers.

Answers

Answer:

81.68

hope this helps

have a good day :)

Step-by-step explanation:

Answer:

The answer is 81.64 square m2

Step-by-step explanation:

All you have to do to find the circumference of a circle, is to, multiply 3.14 x 13(the radius) x 2 to get your answer.

I NEED HELP ASAPPPPPPPP
​

Answers

the value of x is 3 because each big block is 1 x and there is a total of 3 big boxes
Put the block in the box an boom

PLS HELP
What is the greatest common factor(gcf) of the expression 4a3b2 + 6a2b + 8ab3?

a
2ab
b
24ab
c
2a^3b^3
d
24a^3b^3

Answers

Answer:

2ab is the answer! :)

Step-by-step explanation:

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