SSAT Math Question 91: Answer and Explanation
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Question: 91
5. If a class of 6 students has an average grade of 78 before a seventh student joins, what must the seventh student get as a grade in order to raise the class average to 80?
- A. 80
- B. 84
- C. 88
- D. 92
Correct Answer: D
Explanation:
The correct answer is (D). The sum of the first six grades is 78 × 6 = 468. (To find the average grade of 78, divide the sum of the six grades by 6.)
The average with seven students is 468 + x = 80 × 7.
468 + x = 560; x = 92