Difficulty: Medium
Correct Answer: 11/18
Explanation:
Introduction / Context:
This is a layered fraction problem about classifications (women/men, married, with children). The solution adds proportions stepwise and then complements to find the share without children.
Given Data / Assumptions:
Concept / Approach:
Compute the total fraction with children by summing the women-with-children and men-with-children shares. Subtract this from 1 to get the fraction without children.
Step-by-Step Solution:
Women with children = 1/18.Men with children = 1/3.Total with children = 1/18 + 1/3 = 1/18 + 6/18 = 7/18.Therefore, without children = 1 − 7/18 = 11/18.
Verification / Alternative check:
Convert to decimals as a quick check: 7/18 ≈ 0.3889, so without children ≈ 0.6111 which equals 11/18.
Why Other Options Are Wrong:
5/11, 4/9, and 17/36 arise from partial or incorrect aggregation; 7/18 is actually the fraction with children, not without.
Common Pitfalls:
Multiplying instead of taking fractions of group sizes; forgetting to complement at the end.
Final Answer:
11/18
Discussion & Comments