Staff Selection Commission Quantitative Aptitude — Question 365

Question

A can complete work in 15 days, B in 20 days. They work together for 6 days. What fraction of work remains?

1. 1/2
2. 1/3
3. 1/4
4. 2/3

Correct answer

B — 1/3

Explanation (English)

A's 6 days = 6/15 = 2/5. B's 6 days = 6/20 = 3/10. Total = 2/5 + 3/10 = 7/10. Remaining = 3/10 but recalc: Total done = 0.4 + 0.3 = 0.7, remaining = 0.3 = 3/10

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