Question

The sum of two numbers is $45$ and their difference is $9$ find those numbers

Answer 1

Let the numbbers be $a,,b$

Their sum is $45$

$a+b=45a=45-b$

The difference is $9$

$a-b=9a=9+b2a=54a=27b=45-27=18$

So the numbers are $27,18$