Question

the average age of 40 students of a class in 15 years an 18 year old students left the class and a new students was admitted as a rescult the average age fell to 14.885 years. find the age of the new students explain in​

Answer 1

sum of ages of all 40 students=average age times 40

15*40=600

after leaving 18 years old student

sum of ages of 39 students will be 600 - 18= 582

after adding new student with age x

sum of ages of 40 students will become 582+ x

and average would be 582+x/40

which is given as 14.885 so we get equation 582+x/40=14.885

582+x=14.885*40=595.4 x=594.4-582

x=13.4

age of new student is 13.4 years ....hope it will help u..