Multiple choice

A is twice as good as B and together they finish a piece of work in 16 days. The number of days taken by A alone to finish the work is

  1. 20

  2. 21

  3. 22

  4. 24

  5. 26
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

If A is twice as good as B, their efficiency ratio is 2:1. Together they do 3 units of work per day. Total work = 3 * 16 = 48 units. A alone takes 48 / 2 = 24 days.

AI explanation

Let B's daily work rate be x; since A is twice as good, A's daily rate is 2x. Their combined daily rate is 3x, and since they finish the work in 16 days, the total work is 48x. To find the time A alone takes, divide the total work 48x by A's daily rate of 2x, which equals 24 days.

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