Multiple choice

A is twice as good a workman as B and together they finish a price of work in $14$ days. In how many days can A alone finish the work?

  1. $13$
  2. $15$
  3. $17$
  4. $21$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

If A is twice as good as B, A's rate is 2B. Combined rate is 3B. 3B * 14 = 1 (total work). B = 1/42. A = 2B = 2/42 = 1/21. A takes 21 days.

AI explanation

Since A is twice as efficient as B, the ratio of their daily work is 2 to 1, meaning their combined daily work is 3 units. Because they finish the work in 14 days, the total work is 3 times 14, which equals 42 units. A alone works at a rate of 2 units per day, so A will complete the 42 units of work in 21 days.

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