Answer:
53 minutes
Step-by-step explanation:
Let x minutes taken 20 people to paint 20 walls
53 minutes are taken for 6 people to paint 6 walls
Time taken by 1 person= [tex]\frac{53 into 6}{6}[/tex]
Time taken by one person = 53 minutes
Similarly, when 20 people have to paint 20 walls
It will also take 53 minutes.
Hence, the correct answer is 53 minutes.
