"Origami Game" is 23.50 yuan each, and "Grimm's Fairy Tales" is 19.50 yuan each. Xiaohua brought 50 yuan to buy these two books, how much money is left?
《折纸游戏》每本23.50元，《格林童话》每本19.50元．小华带了50元买这两本书，还剩多少元？
<gadget id="calculator">23.5 + 19.5</gadget>
<output>43</output>

<gadget id="calculator">50 - 43</gadget>
<output>7</output>

<result>7</result>