Question

The sum of tow numbers is 5, and their difference is 26. Find the two numbers.

Answer 1

m+n=5

m-n=26

add the equations
2m=31
m= 15.5

but m+n=5 so
n= 5-m=-10.5
check
m-n=26
15.5-(-10.5)=26
checks.