In a class of 80 students, 40% are boys and the rest are girls. The average score in mathematics of all the students is 72. If the average score of the girls is 66, then what is the average score of the boys?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 81.
Number of boys in the class = 40% of 80 = 32
Number of girls = 80 - 32 = 48
Total score of class ion mathematics = 80 × 72 = 5760
Total score of girls = 48 × 66 = 3168
Total score of boys = 5760 - 3168 = 2592
Average = 2592/32 = 81