Question

You owe your brother $10. you have $18 in your wallet. how much will you have left after you pay your brother back?

Answer 1

You will have 8 dollars left. Because 18-10=8 so by subtracting you can find out how much you'll have left.

Answer 2

*You can get your answer by subtracting. 

$18 - $10 = $8.
 
Now you have your answer!