Xiaolan's mother brought 50 yuan to buy vegetables, 28.70 yuan to buy meat dishes, and 6.30 yuan to buy vegetarian dishes. How much money do you have left?
小兰的妈妈带50元钱去买菜，买荤菜用去28.70元，买素菜用6.30元．还剩多少元钱？
<gadget id="calculator">50 - 28.7 - 6.3</gadget>
<output>15</output>

<result>15</result>