AFCAT I 23 Jan 2025 Shift 2 Paper

Average = sum of observations ÷ Total number of observations
Calculation
Let the number are n,n+2,n+4,n+6
We know that
Average = sum of observations ÷ Total number of observations
‌⇒‌ Average ‌=‌

(n)+(n+2)+(n+4)+(n+6)

4

=27
‌⇒‌

4n+12

4

=27
‌⇒n=24
Sum of numbers
n+(n+2)+(n+4)+(n+6)=27×4
Let x is added to the given number then the average becomes 28 .
‌⇒‌

27×4+x

5

=28
‌⇒108+x=140
‌⇒x=32
∴ Required number is 32 .