Multiple choice

3 boys can complete a piece of work in 18 days. 6 women can also complete the same piece of work in 18 days. In how many days will 4 boys and 4 women together complete the same piece of work?

  1. 12 days

  2. 8 days

  3. 6 days

  4. 9 days

  5. 15 days

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

3 boys complete the work in 18 days, so 1 boy's 1 day work is 1/54. Similarly, 1 woman's 1 day work is 1/108. Combined, 4 boys and 4 women do 4/54 + 4/108 = 1/9 of the work per day, so they finish in 9 days.