Bunuel wrote:

In a classroom with 6 girls, the average height is x centimeters. If Jenelle joins the class, the average height will be x−1 centimeters. How tall, in centimeters, is Jenelle?

A. x

B. x − 1

C. x − 6

D. x − 7

E. x − 8

There are 7 girls in the classroom with the inclusion of Jenelle, and the average

height of the class was x centimeters when Jenelle was not there.

Now, Jenelle would have to be 7 centimeters less than the class average

if the new average height of the class is x-1 centimeters.

Therefore, Jennele's height is

x-7(Option D)
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