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
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
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