AlgebraMediumMinimum score for a target average
Algebra practice question
Dario scored 84 and 91 on his first two tests. What is the minimum score he needs on a third test for his three-test average to be at least 88?
Answer: 89
An average of 88 over three tests needs 264 total points. He has 175, so he needs at least 264 − 175 = 89.
Common wrong answers
- If you answered 88
- A score of 88 gives a total of 263, an average just below 88.
- If you answered 90
- 90 works but is not the minimum; 89 already brings the average exactly to 88.
- If you answered 264
- 264 is the required three-test total, not the third score.
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