Question

Kalon and his friend Marna own a chimney sweep service company. Working together, they can clean a chimney in 1 5/7 hours. If it takes Kalon 4 hours to clean a 20-foot chimney by himself, how long does it take Marna to clean the same size chimney by herself?

Answer 1

So to set up the equation we have: 4M4+M=127
28M=12(4+M)
28M=48+12M
28K−12M=48
(28−12)M=48
16K=48
M=4816
M=3 So Marna can clean the chimney alone in 3 hours