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UPSC Prelims 2024CSATLogical ReasoningData Sufficiency - Algebra

Q69. A Question if given followed by two Statement I and
II. Consider the Question and the Statements. A person buys three articles p, q and r for ₹50. The price of the article q is ₹16 which is the least. Question : What is the price of the article p? Statement-I : The cost of p is not more than that of r. Statement-II : The cost of r is not more than that of p.

Which one of the following is correct in respect of the above Question and the Statements?

A. The Question can be answered by using one of the Statements alone, but cannot be answered using the other Statement alone
B. The Question can be answered by using either Statement alone
C. The Question can be answered by using both the Statements together, but cannot be answered using either Statement alone✓ Correct
D. The Question cannot be answered even by using both the Statements together

Detailed Solution

✓ Correct Answer: Option C

We are given: p + q + r = ₹50 and q = ₹16. We also know that q is the least price, so p ≥ 16 and r ≥ 16. Substituting q=16 into the total cost equation: p + 16 + r = 50 => p + r = 34.

**Statement I: The cost of p is not more than that of r.** This means p ≤ r. Given p+r=34 and p,r ≥ 16: - If p=16, then r=18. This satisfies p ≤ r (16 ≤ 18). - If p=17, then r=17. This satisfies p ≤ r (17 ≤ 17).

Since p could be 16 or 17, Statement I alone is insufficient to find a unique value for p. **Statement II: The cost of r is not more than that of p.** This means r ≤ p. Given p+r=34 and p,r ≥ 16: - If p=18, then r=16.

This satisfies r ≤ p (16 ≤ 18). - If p=17, then r=17. This satisfies r ≤ p (17 ≤ 17). Since p could be 17 or 18, Statement II alone is insufficient to find a unique value for p. **Combining Statement I and Statement II:** From Statement I, p ≤ r.

From Statement II, r ≤ p. The only way both conditions can be true simultaneously is if p = r. Substitute p = r into the equation p + r = 34: p + p = 34 => 2p = 34 => p = 17. Since p=17, then r=17.

Both are indeed greater than or equal to q=16. Thus, the price of article p is uniquely determined as ₹17. Therefore, both statements together are sufficient. This question tests data sufficiency and basic algebraic problem-solving.

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