Question

To pass a course with an A grade, a student must have an average of 90 or higher. A student's grades on three tests are 91, 94 and 89.

What is the score that the student must get on the next test to get an A average?

Answer 1

To get an A average, the student must score at least 86 on the next test.

Step-by-step explanation:

To get an A average in the course, the student must have an average of 90 or higher. The student has grades of 91, 94, and 89 on three tests. To find the score the student must get on the next test, we use the formula:

(sum of current grades + score on next test) / 4 = 90

Using this formula, we can calculate:

(91 + 94 + 89 + x) / 4 = 90

Combine like terms:

274 + x = 360

Subtract 274 from both sides:

x = 86

Therefore, the student must score at least 86 on the next test to get an A average.