1) A, B, and C can together do some work in 72 days. A and B can together do two times as much work as C alone, and A and C together can do four times as much work as B alone. Find the time taken by C alone to do the whole work.
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216 days
Explanation:
The work done by A, B and C together =A + B + C = 72 days
A + B = 2C
A + C = 4B
On solving, we get 3C = 72 days and hence C = 72*3 = 216 days
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