Question

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

Answer 1

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

Step-by-step explanation:

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

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

$\frac{M_1\times D_1\times H_1}{W_1}=\frac{M_2\times D_2\times H_2}{W_2}$

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,

$\frac{63\times 4}{9}=\frac{M\times 7}{4}\\\\7\times 4=\frac{M\times 7}{4}\\\\16=M$

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

Answer 2

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.