Verified Answer :

$20+$25=$45 therefore the owner of the company originally had $45

Quick answer = [$45.00]
If he spent $
25.00 and he is left with $20.00 then... 

  $
25.00
+$20.00
= $
45.00 

{Example}  Lets say you had $45 and you went to buy some fast food.. okay in the end your whole meal cost $25 so if your taking that $25 out of your $45 then you would be left with $20. So yeah......