Question

If the average of 11, 23 and K is 40 what is the value of k?

Answer 1

three number their

average = 40

sum = 3 × 40 = 120

11 + 23 + K = 120

34 = 120 - K

k = 120 - 34

K = 86

Answer 2

Let the value of K be X
Then,(11+23+X )÷3=40
(34+X)÷3=40
(34+X)=40×3
X=120-34
X=86
.
. . K=86.