IBPS SO Prelims Exam Model Paper 5

Given:
Average age of Karan and Shyam, five years ago = 27 years
Average age of Karan, Shyam and Anita = 30 years
Formula used:
Average =

sum‌of‌all‌observation

total‌number‌of‌observation

Calculation:
Let the present age of Karan is x years
The present age of Shyam is y years.
And Anita’s present age is z years.
Karan’s age 5 years ago was (x – 5) years
And Shyam’ s age 5 years ago was (y – 5) years.
According to question:
⇒

[(x–5)+(y–5)]

2

= 27
⇒ x – 5 + y – 5 = 54
⇒ x + y = 64
⇒

(x+y+z)

3

= 30
⇒ x + y + z = 90
⇒ 64 + z = 90
⇒ z = 26 ∴ Anita age after 6 years will be 32 years.