Question

Three men A, B and C undertook a job for Rs 1080. A working alone and B working
alone can complete it in 21 days and 28 days respectively. They all together take 7
days to complete the same work. What is the share of C?
1) 360
2) 840
3) 450
4) 540
​

Answer 1

Answer:

450 Option 3

Step-by-step explanation:

C's 1st day work: 1/3 - (1/21 + 1/28) = 5/84

A's share : B's Share : C's Share

1/ 21 : 1/28 : 5/ 84

C's share for 7 days : 7 × 5/84 × 1080 = 450

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