A class of 30 students appeared in a test. The average score of 12 students is 80, and that of the rest is 75. What is the average score of the class?
77
The correct answer is Option 4 i.e. 77.
Sum of the marks of 12 students = 12 × 80 = 960
Sum of the marks of the remaining 18 students = 18 × 75 = 1350
Average score of the class = (1350 + 960)/30 = 2310/30 = 77
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