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8 December, 00:59

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?

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  1. 8 December, 01:05
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    So to set up the equation we have: 4M 4+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
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