what is the sum of two numbers that add up to 12 and their difference is 8

Question

what is the sum of two numbers that add up to 12 and their difference is 8

Answer 1

I assume you meant to say what are two numbers that add up to 12, and their difference is 8.

n + m = 12

n - m = 8

Add the two equations and get

2n = 12 + 8 = 20

n = 10

Plug the result for n into either equation, solve for m, and get

m = 2

Test the answer.