Question

AVG age of 30 boys in a class is 24 years.Avg of 12 boys is X years and AVG of remaining boys is 14 years.Find value of X?

Answer 1

Answer:

i hope u understand ans this 39

Answer 2

Answer: 39

Step-by-step explanation:

Given that

Avg = 24

Sum of observation/ number of observations = 24

S/N = 24

S / 24 = 30

S = 24*30 = 720

Hence sum of the ages of a30 boys is 720 years.

Avg of 12 boys is X

Sum of 12 boys / 12 = X

s / 12 = X

s = 12X

Hence sum of ages of 12 boys is 12X.

Avg of remaining boys is 14 years.

Number of remaining boys is 18 , since 30-12=18.

Sum of ages of 18 boys / 18 = 14

s’ = 18*14

s’ = 252

Hence sum of ages of 18 boys is 252

Now,

Sum of ages of 30 boys = sum of ages of 12 boys + sum of ages of 18 boys.

720 = 12X + 252

12X = 720 - 252

12X = 468.

X = 468/12

X = 39.

Hence X is 39.

Hope this will help you!!