Of the 3 numbers whose average is 22, the first is 3/8th the sum of other two. What is the first number?
1). 16
2). 20
3). 22
4). 18
Let the three number are x, y and z
Given x = [3(y + z)] /8
⇒ y + z = 8x/3
Now as given average of three numbers is 22,
⇒ x + y + z = 66
⇒ x + 8x/3 = 66
⇒ 11x = 198
⇒ x = 18
∴ First number is 18.