Question

Two customers went to the grocery store to buy apples and watermelon. Each apple costs the same
amount, and each watermelon costs the same amount.
The first customer paid $15 for 12 apples and 3 watermelons.
The second customer paid $16.20 for 5 apples and 14 watermelons.
What was the cost in dollars of each watermelon?

Answer 1

Step-by-step explanation:

Let the number of pineapples and watermelons be x and y respectively.

Then, 7x+5y=38 or 5y=(38−7x) or y=

5

38−7x

.

Clearly, y is a whole number, only when (38−7x) is divisible by 5.

This happens when x=4.