Q. A can do a work in 10 days. B can do the same work in 20 days. They work together for 4 days. What fraction of work remains?
✅ Correct Answer: (A)
1/5
Explanation: Daily work = 1/10 + 1/20 = 3/20. In 4 days = 12/20 = 3/5 done. Remaining = 2/5.
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