A can finish a job in days and B in days. Working together, in how many days can they finish it?
Answer and explanation
Correct answer: B. 12
- Step 1: Determine the daily work rates: A finishes of the job per day, and B finishes of the job per day.
- Step 2: Sum their individual rates to find the combined daily rate: .
- Step 3: Invert the combined rate to find the total days required: .
Answer
12.
Why not the others: The alternative numerical choices (64, 32, 14) stem from misinterpreting algebraic constraints, applying wrong arithmetic operations, or calculation slips.
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