Question

If the average age of 20 students in ClassI is 10 years and average age of 25 students in Class II is 12 years, find the average age (in yean) of all students. ​

Answer 1

Answer:

Given:

The average age of 20 students of class 1=10

X/20=10

X=200

average age of 25 students of class 2=12

y/25=12

y=300

Therefore average age of all students=X+y/2

=200+300/2

=500/2

=250 years

Answer 2

Answer:

11.111

Step-by-step explanation:

average age of class 1 = 10yrs

total age = 20×10 = 200 yrs

average age of class 2 = 12yrs

total age = 25×12 = 300yrs

therefore, avg age of all students = 300+200

----------------

20+25

= 500/45 = 11.111