Question

Susan has four 20 point projects for math class. Susan's scores on the first 3 projects are shown below:
Project 1: 18
Project 2: 15
Project 3: 16
Project 4: ??
What does she need to make on Project 4 so that the average for the four projects is 17? Explain your reasoning.

Answer 1

17*4=68
68-18=50
50-15=35
35-16=19
19

Answer 2

$19$  is the score she need to make on Project $4$

What is average?

In ordinary language, an average is a single number taken as representative of a list of numbers, usually the sum of the numbers divided by how many numbers are in the list. For example, the average of the numbers $2, 3, 4, 7,$ and $9$ is $5.$

According to question, Susan has four 20 point projects for math class. Susan's scores on the first 3 projects are shown below:

Project 1: $18$

Project 2: $15$

Project 3: $16$

Project 4: ??

We have to find how much Susan score in Project $4$

Let the project 4 score of Susan be $x$

So, $18+15+16+x=17$×$4$

⇒$x=68-49=19$

Hence, we can conclude that $19$  is the score Susan need to make on Project $4$.

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