SOLUTION: In a class of 10 boys and 15 girls, the boys’ average score on the final exam was 80 and the girls’ average score was 90. What was the average score for the whole class?
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Question 245898: In a class of 10 boys and 15 girls, the boys’ average score on the final exam was 80 and the girls’ average score was 90. What was the average score for the whole class? Answer by solver91311(24713) (Show Source):
If the average score for 10 boys is 80, then the total score for the 10 boys must be 800. If the average score for 15 girls is 90, then the total score for the 15 girls must be 1350. That means the total score for the 25 students must be 800 plus 1350 equals 2150. Divide 2150 by 25 to get the average for the whole class. As a check on your arithmetic, common sense says that the answer has to be larger than 80 but smaller than 90.
