A class of 25 students took an English test. 15 students had an average score of 80. The other students had an average score of 60. What is the average score of the whole class?
A.80
B.74
C.76
D.72✓ Correct
Explanation
Total score = 15×80 + 10×60 = 1200 + 600 = 1800. Average = 1800/25 = 72.
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