10boys can dig apitch in12 hours. how long will8 boys take to do it?
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m1×t1 =m2×t2
10×12=8×t2
t2=10×12/8
t2=120/8
t2=15 hours is time taken by 8 boys
10×12=8×t2
t2=10×12/8
t2=120/8
t2=15 hours is time taken by 8 boys
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