Question

Craig is making 3 recipes for his party. He has a containerof flour on his kitchen scale. The table shows the totalchange in weight of the flour on the scale after each ofthe 3 recipes. What is the average change in the amountof flour, in ounces, used in the 3 recipes?

Answer 1

C

Explanation:

The average change in the amount of flour is the sum of the changes after each recipe divided by the number of recipes.

Sum of changes:

`-2-3(1)/(2)-4(1)/(2)=-2-(3\ast2+1)/(2)-(4\ast2+1)/(2)=-2-(7)/(2)-(9)/(2)`
`-2-(7)/(2)-(9)/(2)=-2-(7+9)/(2)=-10`

Average:

3 recipes.

Total is -10.

-10/3 = 3 with rest 1. So as a mixed number, the correct answer is option C.