Multiple choice

A can do a work in 36 days and B can do the same work in 45 days. In how many days will they together complete the same work?

  1. 12 days

  2. 16 days

  3. 18 days

  4. 20 days

  5. 22 days
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A's 1 day work = 1/36, B's 1 day work = 1/45. Combined 1 day work = 1/36 + 1/45 = (5+4)/180 = 9/180 = 1/20. Therefore, they complete the work together in 20 days. Option D is correct.

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