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 [tex]\frac{48}{7}[/tex] minutes.
and 1 people to paint 1 walls in [tex]\frac{48}{7\times 7}[/tex] minutes.
Now, We have to find minutes does it take 20 people to paint 20 walls.
20 walls will be painted in [tex]\frac{48\times 20}{7\times 7}[/tex] minutes.
20 people to paint 20 walls in [tex]\frac{48\times 20\times 20}{7\times 7}[/tex] minutes.
i.e. [tex]\frac{48\times 20\times 20}{7\times 7}=\frac{19200}{49}=391.83[/tex]
Therefore, Approximately 391 minutes taken by 20 people to paint 20 walls.
