Answer:
48 minutes.
Step-by-step explanation:
We have been given that it takes 48 minutes for 7 people to paint 7 walls. We are asked to find time taken by 20 people to paint 20 walls.
First of all, we will find time taken by one person to paint one wall as:
[tex]\text{Time taken by one person to paint 7 walls}=48*7\text{min}[/tex]
[tex]\text{Time taken by one person to paint 1 wall}=\frac{48*7\text{min}}{7}[/tex]
[tex]\text{Time taken by one person to paint 1 wall}=48\text{min}[/tex]
[tex]\text{Time taken by one person to paint 20 walls}=48*20\text{min}[/tex]
[tex]\text{Time taken by 20 people to paint 20 walls}=\frac{48*20\text{min}}{20}[/tex]
[tex]\text{Time taken by 20 people to paint 20 walls}=48\text{min}[/tex]
Since one person can paint one wall in 48 minutes, so 20 people will paint 20 walls in 48 minutes as well.
