Question

a b and c can do a work in 10 days 12 days and 15 days respectively how many days will they take to do the same work when work together​

Answer 1

Answer:

A's 1 day work = 1/10

B's 1 day work = 1/12

C's 1 day work = 1/15

( A + B + C ) 's 1 day work = ( 1/10+1/12+1/15) = 6+5+4/60 = 15/60 = 1/4

Therefore A , B and C can together work for ( 1÷ 1/4) days = 4 days

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