Multiple choice

P and Q together can complete a work in 20 days. If Q alone can complete the work in 25 days, then in how many days P alone can complete the same work?

  1. 25 days

  2. 100 days

  3. 20 days

  4. 50 days
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Combined work rate of P and Q is 1/20 per day. Q's individual rate is 1/25 per day. Therefore P's rate = 1/20 - 1/25 = (5-4)/100 = 1/100 work per day, meaning P alone takes 100 days.

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