A) 15 years
B) 19 years
C) 16 years
D) Can't say
Correct Answer: B
Solution :
Let number of boys and girls be and respectively. Total number of students = 40 Number of boys And number of girls = 10 Now, after decreasing 10 boys, number of boys is 20. Average age of 20 boys = 20 years. Sum of age of 20 boys Also, after increasing 5 girls, number of girls is 15. Average age of 15 girls = 18 years Sum of age of 15 girls Now, total number of students Average age of students years (approx.)You need to login to perform this action.
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