Discussion :: Average
- Average age of a group of 30 boys is 16 years. A boy of age 19 leaves the group and a new boy joins the group. If the new average age of the group is 15.8 years, find the age of the new boy.
Answer : Option B
Explanation :
Let the age of new boy = X years
Total age of 30 boys = 30*16 = 480 years
As per question, if we minus age of boy who leaves the group and then add the age of boy who joins the group the new average becomes = 15.8 years.
∴ = 15.8
480 - 19 + X = 474
X = 474 - 480 +19
X = - 6 +19
= 13 years
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