The average age of a group of persons going for picnic is years.

The average age of a group of persons going for picnic is years. Fifteen new persons with an average age of 15 years join the group on the spot due to which their average age becomes 15.5 years. The number of persons initially going for picnic is

Quiz

Answer/Solution

15

Steps/Work

Solution
Let the initial number of persons be x. Then
16x + 15 x 15 = 15.5(x+20)
= 0.5x = 7.5
x = 15.
Answer C

General Calculator / Auto Solver

The average age of a group of persons going for picnic is years. Fifteen new persons with an average age of years join the group on the spot due to which their average age becomes years. The number of persons initially going for picnic is

Calculated Answer

15

Step by Step Solution

In order to solve problem, you must evaluate (n0 * n1) / n1.

n0 =15
n1 =15.5