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: D. 8
- Step 1: Determine the work completed per day: A completes of the work daily, and B completes daily.
- Step 2: Sum the work rates for their joint effort: .
- Step 3: Invert the rate to find the required duration: .
Answer
8.
Why not the others: The alternative numerical choices (30, 50, 25) stem from misinterpreting algebraic constraints, applying wrong arithmetic operations, or calculation slips.
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