human
Delores has some money. She buys a computer for $400 and a printer for $40. If she has $10 left, how much money, in dollars, did Delores have at first?
assistant
How much do the computer and printer cost together? ** The computer and printer cost 400+40=<<400+40=440>>440 dollars.
How much money did Delores have at first? ** Delores had 440+10=<<440+10=450>>450 dollars at first.
#### 450