Multiple choice

Sangram can complete a work in 21 days and Aman can complete the same work in 28 days. If both work together for 7 days, then what fraction of work is left?

  1. 3/5

  2. 2/3

  3. 7/12

  4. 5/12
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sangram's rate = 1/21, Aman's rate = 1/28. Combined rate = 1/21 + 1/28 = 4/84 + 3/84 = 7/84 = 1/12. In 7 days, work done = 7 × 1/12 = 7/12. Remaining work = 1 - 7/12 = 5/12. Option D is correct.

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