Multiple Choice Questions

A and B can do a piece of work in 10 days B and C in 15 days and C and A in 20 days C alone can do t...........

Math and Mental Ability Time and work

A and B can do a piece of work in 10 days, B and C in 15 days and C and A in 20 days. C alone can do the work in

60 days

120 days

80 days

30 days

A+B+C work 13/2 units/day

A+B work 6 unit/day

C work/day = (A+B+C) - (A+B)

13/2 − 6/1 = 1/2 unit/day

C will finish in 60/1/2 = 120 days

Hence, option 2 is the correct answer.

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