Question

Average age of 55 students in a class is 21
years and average age of 25 girls-students
is 19 years. What is the average age of
boys-students in the class?​

Answer 1

Answer:

answer is 22.6

for above question

Answer 2

Answer:

22 2/3

Explanation:

Total age of students=55×21

=1155

Total age of girls =25×19

=475

Total age of boys =1155-475

=680

Total no of boys = Total no students-Total

no of girls

=55-25

=30

Average age of boys = Total age of boys / Total no of boys

= 680/30

= 22 20/30(mixed fraction)

=22 2/3( cancel 20 and 30)