The fox bought a 45-yuan fur coat from the old goat’s store with a 50-yuan counterfeit note, and the old goat gave the fox 5 yuan in change, so you know how much money the old goat lost.
狐狸用50元的假钞买走了老山羊店里一件45元的皮衣，老山羊还找给狐狸5元钱，那么你知道老山羊损失了多少元钱．
<gadget id="calculator">45 + 5</gadget>
<output>50</output>

<result>50</result>