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

 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.

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,

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

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step-by-step explanation: