Mathematics · Time and Work
A alone can finish a work in 15 days. A works only for the first two days and the last two days. The rest of the work is done by B and the work is completed in 20 days. In how many days can A and B together finish the work?
- 170 8
- 280 9✓
- 380 7
- 490 8
Correct answer
80 9
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