Question

The average of 3 numbers is 12. If one

of the numbers is 8, what is the sum
of the other two numbers?

Answer 1

Let the variables X & Y represent the 2 missing numbers.

So, (8 + X + Y)/3 = 12

multiply both sides of the equation by 3 to get 8 + X + Y = 36

subtract 8 from both sides of the equation to get X + Y = 28

So, the sum of the 2 missing numbers is 28!

To check 8 + 28 = 36 and 36/3 = 12