Question

The average of three numbers is 36. The average of two of these numbers is 48. What is the third number?

Answer 1

total of three nos is 3*36=108
total of two nos is 2*48=96
third no=108-96=12

Answer 2

Let the numbers be a,b&c

The average of 3 number is 36.

--》(a+b+c)/3=36

--》 a+b+c=108—->Equ 1

The average of 2 numbers is 48

--》(a+b)/2=48

--》a+b=96—→Equ 2

Substitute Equ 2 in Equ 1

--》96+c=108

--》c=108–96

--》c=12

The third number is 12.