Question

Greg sold small boxes of candy for $3 and

large boxes for $5. He sold a total of 21
boxes for $87. How many large boxes did he sell?

Answer 1

12 large boxes, 9 small boxes

Explanation:

Let s = number of small boxes

l = number of large boxes

We set up and solve this system of equations:

s + l = 21------->3s + 3l = 63

3s + 5l = 87------>3s + 5l = 87

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2l = 24

l = 12, s = 9