Q.

If A, B, C can do a work in 90, 30 and 45 days respectively. If they work together, the time taken to complete the work is

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a

15 days

b

10 days

c

20 days

d

25 days

answer is A.

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Detailed Solution

A=901 day work=190

B=301 day work=130

C=451 day work=145

A+B+C=190+130+145=2+6+4180=12180=115

A,B,C can finish in 15 days.

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