Discussion
A pineapple costs Rs. 7 each. A watermelon costs Rs. 5 each. X spends Rs. 38 on these fruits. The number of pineapples purchased is
Answer: C
Correct answer: 4
\( 7p + 5w = 38 \) with \( p \) and \( w \) whole numbers. Working modulo 5, \( 2p \equiv 3 \), so \( p \equiv 4 \); and \( p=9 \) already exceeds 38, so \( p=4 \) is the only possibility, with \( w=2 \). Checking: \( 28 + 10 = 38 \). The solution is unique, so the data are not inadequate.
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