Question

In order to get a C in her math class, a student needs to get an average of a 75 on three tests. She scored a 72 and an 81 on her first two tests. What

score does she need on her third test to earn the C?
Please show equation in answer

Answer 1

To earn a C in her math class, the student needs to score a 72 on her third test.

Step-by-step explanation:

To find out what score the student needs on her third test to earn a C in her math class, we can use the equation for average:

Average = (sum of scores) / (number of scores)

In this case, the average needs to be 75, and the student has already scored a 72 and an 81 on her first two tests. Let's represent the score on her third test as x. The equation becomes:

(72 + 81 + x) / 3 = 75

Multiplying both sides by 3 gives:

72 + 81 + x = 225

Combining like terms gives:

153 + x = 225

Subtracting 153 from both sides gives:

x = 72

Therefore, the student needs to score a 72 on her third test to earn a C in her math class.