A and B do a work in 10 days, B and C in 15 days, C and A in 18 days. If A, B and C work together, they will complete the work in:

Options
- 8 days
- 9 days
- 10 days
- 11 days

CORRECT ANSWER : 9 days

Discussion Board
work and time

2(a+b)=10
2(b+c)=15
2(a+c)=18
so lcm take 90
9,6,5
added all becomes 20
but her work added 2 pepoles
so one is equal to 10
then finally becomes 90 pepoles 9 days


nikita mhamane 01-10-2022 06:26 AM

Electronics and Communication Engineer

A+B = 10
B+C = 15
C+A = 18
work done together:
2(A+B+C) = 1/10 +1/15 + 1/18 = 2/9
WORK DONE = 1/9
Work done is inverse of days taken. Hence, the answer is 9 days.

Vidhi Bindal 05-2-2021 07:44 AM

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