10 boys can dig a pitch in 12 hours. How long will 8 boys take to do it?
(a) 9 h 36 min
(b) 15 h
(c) 6 h 40 min
(d) 13 h 20 min

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Solution

(b) 15 h
Time taken by 10 boys to dig a pitch = 12 hours
Time taken by 1 boy to dig a pitch = 12 × 10 = 120 hours (less boys means more time)
Time taken by 8 boys to dig a pitch = 120 = 15 hours
8

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10 boys can dig a pitch in 12 hours. How long will 8 boys take to do it? (a) 9 h 36 min (b) 15 h (c) 6 h 40 min (d) 13 h 20 min

(b) 15 h Time taken by 10 boys to dig a pitch = 12 hours Time taken by 1 boy to dig a pitch = 12 × 10 = 120 hours (less boys means more time) Time taken by 8 boys to dig a pitch = 120 = 15 hours 8

10 boys can dig a pitch in 12 hours. How long will 8 boys take to do it?
(a) 9 h 36 min
(b) 15 h
(c) 6 h 40 min
(d) 13 h 20 min

(b) 15 h
Time taken by 10 boys to dig a pitch = 12 hours
Time taken by 1 boy to dig a pitch = 12 × 10 = 120 hours (less boys means more time)
Time taken by 8 boys to dig a pitch = 120 = 15 hours
8