Difficulty: Medium
Correct Answer: 2
Explanation:
Introduction / Context:Two different mixed teams complete the same job in different times. Set up equations in terms of man (m) and boy (b) daily work to solve for the ratio m/b.
Given Data / Assumptions:
Concept / Approach:Equate the two expressions for W, then solve for m in terms of b.
Step-by-Step Solution:
56m + 48b = 40m + 80b16m = 32b → m = 2bThus, man : boy (1-day work) = 2 : 1Verification / Alternative check:Substitute m = 2b into either team equation to confirm both give the same total job W.
Why Other Options Are Wrong:Ratios like 1 1/2 or 3 misrepresent the algebraic balance between m and b.
Common Pitfalls:Mixing the total-time equality with rate equality; always equate total work W.
Final Answer:2
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