Difficulty: Medium
Correct Answer: 242
Explanation:
Introduction / Context:
This word problem tests proportional reasoning and careful setup of fractional parts of a whole. We translate the narrative into algebra involving the total score T and compute the two specified top scores.
Given Data / Assumptions:
Concept / Approach:
Express both H and N in terms of T, then take their difference and equate it to 18. Solve for T using straightforward linear algebra. Fractions must be handled carefully; adopting a common denominator helps avoid mistakes.
Step-by-Step Solution:
Verification / Alternative check:
Compute scores: H = (3/11)*242 = 66; N = (24/121)*242 = 48; difference = 18, matching the condition.
Why Other Options Are Wrong:
244, 294, 255, and 231 do not satisfy the difference equation H − N = 18 when substituted.
Common Pitfalls:
Using 3/11 of the total again for the second score instead of 3/11 of the remainder, or subtracting in the wrong order leading to a negative difference.
Final Answer:
242
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