Interpreting mixed accuracy data: Rajesh solved 80% questions correctly. The statement provides inconsistent partial counts (37 correct out of 41, and 5 correct out of another 8). What is the total number of questions?
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A75
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B65
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C60
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DCan't be determined
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E70
Answer
Correct Answer: Can't be determined
Explanation
Introduction / Context:Sometimes test statements contain conflicting partial data. Here we are told Rajesh solved 80% correctly and also given two overlapping fragments: “37 correct out of 41” and “5 correct out of 8” from the remainder. Interpreting these simultaneously produces incompatible totals.
Given Data / Assumptions:
- Overall: 80% of total questions answered correctly.
- Fragment A: 37 correct out of a set of 41.
- Fragment B: 5 correct out of another set of 8.
- All questions carry equal marks; no negative marking is mentioned.
Concept / Approach:If we combine the fragments as disjoint parts, total correct = 37 + 5 = 42. Then 42 is 80% of total ⇒ total = 52.5, which is impossible. Alternative readings also fail to yield a consistent integer total. Hence the data are insufficient or contradictory for a unique total.
Step-by-Step Solution:Assume disjoint sets: correct = 37 + 5 = 42Total = 42 / 0.80 = 52.5 ⇒ not integral ⇒ inconsistencyOther interpretations (subset/superset) likewise do not produce a definitive integer total.
Verification / Alternative check:Try treating 41 as the total attempted; then 37 correct contradicts the “80% of total” unless the total equals 46.25, also impossible. The statement remains ambiguous.
Why Other Options Are Wrong:75, 65, 60 provide arbitrary totals not supported by the given fragments and 80% condition.
Common Pitfalls:Forcing a calculation by rounding or discarding parts of the data; instead, recognize when the information is inadequate to fix a unique value.
Final Answer:Can't be determined