Question

If it takes 63 minutes for 4 people to paint 9 walls, how many minutes does it take for 7 people to paint 4 walls ?

Answer 1

49 minutes

Explanation:

knowing that the more people, the lower the time (divide), and the more walls, the more time (multiply)

1. find how long it takes 1 person to paint 1 wall:

63 minutes/9 walls = 7 minutes/wall with 4 people

7 minutes * 4 people = 28 minutes/wall with 1 person

2. Find for 7 people and 4 walls: 28 minutes * 7 people/4 walls = 196/4 =

49 minutes

Answer 2

The correct answer is 16 minuets!

Explanation:

You can use the formula PRT=w

(P=people) (R=rate) (T=time) (w-work)

You would start by plugging the numbers in for the given information:

(4 people)*(r)*(63min)=9walls

then solve for r

in this case r=.035714286

You can use this infromation to find what is being asked and the previously mentioned formula:

(7 people)*(.035714286)*(t) = 4 walls

Now all you have to do is solve for t to get the answer.

In this case t=16

(I also just had this question asked on an online quiz and got it correct so I know the answer is right)

Hope this helps!