Question

11. There are 40 boys in class VIII and their average age is 14 years. Also, there
are 35 boys in class IX and their average age is 15 years. Find the average
age of both the classes.
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Answer 1

Step-by-step explanation:

avg. age of class viii=14

total age of class/ no of students in class = 14

total age of class / 40 = 14

so total age of class = 560

similarly total age of class is = 525

now total age of both classes = 1085

and total no. of students = 40 + 35 = 75

then their avg. = 1085/75 = 14.466

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