AlgebraEasy–MediumLeast fourth score for a target average
Algebra practice question
A student needs an average of at least 80 on four tests. Her first three scores are 74, 85, and 79. What is the least score she needs on the fourth test?
Answer: 82
Four tests averaging 80 total 320, and 320 − 238 = 82.
Common wrong answers
- If you answered 78
- 78 subtracts 2 from 80 instead of adding.
- If you answered 80
- 80 assumes the fourth score equals the target average.
- If you answered 92
- 92 uses a total of 330.
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