A and B can complete a work together in 12 days. If A alone can complete the same work in 20 days, how many days will B alone take to finish the work?
Answer and explanation
Correct answer: A. 30 days
- Step 1: Calculate the daily rate of work: Combined rate per day, and A's individual rate per day.
- Step 2: B's individual rate . Finding a common denominator (60): . Therefore, B alone requires to complete the work.
Answer
30 days.
Why not the others: '25 days' divides 60 by 2.4; '28 days' subtracts ; '35 days' uses an incorrect denominator of 70.
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