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