A liar went to the store and bought something worth 5 yuan. He paid the clerk 50 yuan, and the clerk gave him the rest of the money. At this time, he said he had change, so he gave the clerk 5 yuan in change and asked After returning the 50 yuan given at the beginning, I would like to ask: How much money did this liar cheat in total?
一个骗子到商店买了5元的东西，他付给店员50元钱，然后店员把剩下的钱找给了他；这时他又说自己有零钱，于是给店员5元的零钱，并且要回了开始给出的50元，请问：这个骗子一共骗了多少钱？
<gadget id="calculator">50 - 5 - 5</gadget>
<output>40</output>

<gadget id="calculator">40 + 5</gadget>
<output>45</output>

<result>45</result>