Question

It takes 63 minutes for 4 people to paint 9 walls.

How many minutes does it take 7 people to paint 4 walls?

Answer 1

You need to find the rate...

4p*63m=9w

w=28pm so it takes 28 person*minutes to paint 1 wall so

4w(28pm/w)/7p=16min

So it would take 16 minutes for 7 people to paint 4 walls.

Answer 2

Answer: 7 people need 16 minutes to paint 4 walls.

Explanation:

Since we have given that it takes 63 minutes to paint 9 walls ,

So, we will apply "time and work formula" i.e.

`(M_1* D_1* H_1)/(W_1)=(M_2* D_2* H_2)/(W_2)`

where,

H denotes number of hours or minutes,

D denotes number of days

M denotes number of men

W denotes work done them,

So, we need to calculate number of minutes for 7 people to paint 4 walls,

`(63* 4)/(9)=(M* 7)/(4)\\\\7* 4=(M* 7)/(4)\\\\16=M`

So, 7 people need 16 minutes to paint 4 walls.