Question
You have made scores of 81,76, and 82 on three quizzes. What is the least you can make on the fourth quiz to have an average of at least 80?
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Answer to a math question You have made scores of 81,76, and 82 on three quizzes. What is the least you can make on the fourth quiz to have an average of at least 80?
Birdie
4.5102 Answers
1. Calculate the sum of the three quizzes:
81 + 76 + 82 = 239
2. Let \( x \) be the score on the fourth quiz.
3. The average of the four quizzes should be at least 80:
\frac{239 + x}{4} \geq 80
4. Multiply both sides by 4 to clear the fraction:
239 + x \geq 320
5. Subtract 239 from both sides to solve for \( x \):
x \geq 81
Therefore, the least you can make on the fourth quiz to have an average of at least 80 is:
\text{Answer} \geq 81
2. Let \( x \) be the score on the fourth quiz.
3. The average of the four quizzes should be at least 80:
4. Multiply both sides by 4 to clear the fraction:
5. Subtract 239 from both sides to solve for \( x \):
Therefore, the least you can make on the fourth quiz to have an average of at least 80 is:
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