Problema Solution
4 people can paint 7 walls in 30 minutes.
How many minutes will it take for 9 people to paint 9 walls? Round to the nearest minute.
Answer provided by our tutors
4 people paint 7 walls in 30 min
4 people paint 9 walls in m1 min
7 : 30 = 9 : m
m1 = 30*9/7
4 people paint 9 walls in 30*9/7 min
9 people paint 9 walls in m2 min
4*30*9/7 = 9*m2
m2 = 17.4 min = 17 min
9 people paint 9 walls in 17 minutes.