Question

Chef Sydney is making pasta for dinner. She knows that 15 servings of pasta can feed 8 people. If she plans on feeding 21 people, how many servings of pasta will she have to make? Write your answer as a whole number.

Answer 1

Answer: 40 servings

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Work Shown

(15 servings)/(8 people) = (x servings)/(21 people)

15/8 = x/21

15*21 = 8x

315 = 8x

8x = 315

x = 315/8

x = 39.375

We round up to the nearest integer to get x = 40 servings needed.

It might be tempting to round to 39, but this won't be enough servings.

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Another approach

15 servings feed 8 people

15/8 = 1.875 is the number of servings per person

So it's about 2 servings per person.

21*1.875 = 39.375 which was mentioned in the previous section.

This rounds up to 40 servings.