11. A and B can together finish a work in 30 days. They worked at it for 20 days and then B left. Theremaining work was done by A alone in 20 more days. In how many days can A alone do it?
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Answer: 60
Explanation:
If A and B together can complete a work in 30 days then they are doing 1/30 of the work per day
Amount of work done in 20 days = 20 × 1/30 = 2/3
Amount of work remaining = 1 - 2/3 = 1/3
Since A took 20 days to complete 1/3 of the work,
Total time A would have taken to complete the entire work alone = 20/(1/3) = 20×3 = 60
Hope this helped
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