| A can do a job in 20 days, Bin 30 days and C in 60 days. If A is helped by B and C every 3rd day, then how long will it take for them to complete the job? |
A) 18 days
B) 15 days
C) 16 days
D) 14 days
Correct Answer: B
Solution :
| As A is helped by B and C every third day. A works for 3 days while B and C work for 1 day in every three days. |
| \[\therefore \]Work done by A, B and C in 3 days |
| \[=\frac{3}{20}+\frac{1}{30}+\frac{1}{60}=\frac{12}{60}=\frac{1}{5}\] |
| So, A, B and C in 3 days can do \[\frac{1}{5}\]of the work, |
| Hence, A, B and C complete the work in 15 days. |
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