(x + 2)/171

(171 + x)/2

(171 – x)/2

### 4 Answers

(x + 2)/171

(171 + x)/2

When you calculate the average of numbers, you take the sum of the numbers and divide by how many numbers you are using. So the average of 171 and x would be the sum of 171 and x (171+x), then divided by 2, because you have two numbers, 171 and x.

(x + 2)/171

(171 + x)/2