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Answer:
Approximately 391 minutes taken by 20 people to paint 20 walls.
Step-by-step explanation:
Given : It takes 48 minutes for 7 people to paint 7 walls.
To find : How many minutes does it take 20 people to paint 20 walls?
Solution :
7 people to paint 7 walls in 48 minutes.
So, 1 people to paint 7 walls in minutes.
and 1 people to paint 1 walls in minutes.
Now, We have to find minutes does it take 20 people to paint 20 walls.
20 walls will be painted in minutes.
20 people to paint 20 walls in minutes.
i.e.
Therefore, Approximately 391 minutes taken by 20 people to paint 20 walls.