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

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Solution

(b) 15 hrs
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 would take more hours.)
Time taken by 8 boys to dig a pitch = 120 = 15 hours
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10 boys can dig a pitch in 12 hours. How long will 8 boys take to do it? (a) 9 hrs 36 min (b) 15 hrs (c) 6 hrs 40 min (d) 13 hrs 10 min

(b) 15 hrs 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 would take more hours.) 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 hrs 36 min
(b) 15 hrs
(c) 6 hrs 40 min
(d) 13 hrs 10 min

(b) 15 hrs
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 would take more hours.)
Time taken by 8 boys to dig a pitch = 120 = 15 hours
8