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A can do as much work in 4 days as B can do in 5 days, and B can do as much work in 6 days as C in 7 days. In what time will C do a piece of work which A can do in a week ?
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10 5 days 24 -
4 4 days 5 -
6 8 days 15 -
12 6 days 19
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Correct Option: A
A’s 4 days’ work = B’s 5 days’ work
⇒ A : B = 4 : 5
Again, B : C = 6 : 7
∴ A : B : C = 4 × 6 : 5 × 6 : 5 × 7 = 24 : 30 : 35
∵ Time taken by A = 7 days
| ∴ Time taken by C = | × 7 | 24 |
| = | = 10 | days | ||
| 24 | 24 |
