The average of 3 numbers is 16. The average of 2 numbers is 15. What is the third number?

Answer 1

Let's call the three numbers A, B and C.

According to the information given:

(A + B + C)/3 = 16

and

(A + B)/2 = 15

From the second equation, we can rearrange it to get:

A + B = 30

Next, we can substitute the value of A + B into the first equation:

(30 + C)/3 = 16

30 + C = 48

C = 48 - 30

C = 18

Therefore, the third number is 18.