Answer:
You need to get a 95 on the next test to have a 90 grade average.
Step-by-step explanation:
(85 + 90 + n)/3 = 90
Step 1: Multiply both sides by 3
(85 + 90 + n)/3 * 3 = 90 * 3
85 + 90 + n = 270
Step 2: Subtract 85 from both sides
85 + 90 + n - 85 = 270 - 85
90 + n - 90 = 185 - 90
n = 95
Answer: You need to get a 95 on the next test to have a 90 grade average.
