Cost of a pineapple will be Rs 7 each whereas a watermelon will cost Rs 5 each A man spends a total ...........

Logical Reasoning(Master ) Arithmetical Reasoning

Cost of a pineapple will be Rs. 7 each whereas a watermelon will cost Rs. 5 each. A man spends a total of Rs. 38 on these fruits. The number of pineapples that he purchased were:

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Explanation:

Let the number of pineapples and watermelons be x and y respectively.
Then, 7x + 5y = 38 or 5y = (38 - 7x) or y = 38 - 7x / 5
Clearly, y is a whole number, only when (38 - 7x) is divisible by 5.
This happens when x = 4.

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