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 will take 16 minutes to paint 4 walls.

Step-by-step explanation:

Since, if people take times for work and in the same kind of work people take time for work,

Then,

Here, , , ,

,

By substituting the values in the above formula,

By the cross multiplication,

Hence, 7 people will take 16 minutes to paint 4 walls.