Question

One bag of chips serves about 5 people. If you want to have a picnic with 18 people, how many whole bags of chips should you get? Assume you want as little left over as possible.

Answer 1

4 bags

Explanation:

3 bags would only cover 15 people so the next lowest amount is 4 bags.

Answer 2

4 bags of chips

Explanation:

1 bag x bags

-----------------= -------------------------

5 people 18 people

using cross products

1 * 18 = 5 * x

18 = 5x

divide by 5

18/5 = x

3 3/5 =x

but we can't buy 3/5 of a bag of chips so we round up

4 bags of chips