math
posted by Mota .
Melons cost QR1.5 each and apples cost QR3.75 per kilogram. A man buys apples and melons at the supermarket. Write a formula to describe the total cost of his purchase.
Investigate how many melons and how many kilograms of apples he could buy for QR30.
**QR is a currency :)

First you must define your variables.
In full sentence form define
apples > a
melons > m
then Cost = 3.75a + 1.5m
second equation:
3.75a + 1.5m ≤ 30
multiply this equation by 4
15a + 6m ≤ 120 , dividing by 3
5a + 2m ≤ 40
2m ≤ 40  5a
For m to be a whole number, the right side of the above statement has to be even, so a must be an even number
0 ≤ a ≤ 8
so give a values of 0, 2, 4, 6, and 8