Question

To get an A in a course, you must have an average of at least 90% on four tests worth 100 points each. Your scores so far are 85, 94, and 84. What must you score on the fourth test to get an A in the course?

Answer 1

A score of 117 is needed, which Is not possible since the test is over 100.

Explanation:

The other 3 scores are 85, 94,84 . Let's x be the 4th score he must score.

Therefore ( 85 + 94 + 84 + X)/4 =95

Then 263+X /4 =95

Cross mutiplying 4*95=263+X

Therefore X= 380-263

X= 117 which is not possible since the test score is over 100.