Multiple choice

P can finish a work in 15 days and Q can do the same work in 18 days. P worked for 10 days and left the job. In how many days, Q alone can finish the remaining work?

  1. 5 days

  2. 6 days

  3. 7 days

  4. 8 days
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

P's 1 day work = 1/15. In 10 days, P completes 10/15 = 2/3 of work. Remaining work = 1/3. Q's 1 day work = 1/18. Time for Q to finish 1/3 work = (1/3) ÷ (1/18) = 18/3 = 6 days.

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