Question

Average age of 40 students in class VII is 12 years. Two new students join
and the average age becomes 12.4 years. What is the total of the 2 new students?

Answer 1

Answer:

.2percent will be answere

Answer 2

Let the original strength of the class be x
Then Total age of x students =40x years
Total age of 12 new students =12×32=384 years
New average of (x+12) students =40−4=36 years
Therefore, total age of (x+12) students =(x+12)×36=(36x+432)years
Thus 40x+384=36x+432
⇒ 4x=48
⇒ x=12