I have 50 yuan, I bought a hamburger, and I have 38 yuan left. How much is a hamburger? (column equation solution)
我有50元钱，买了一个汉堡，还剩38元．一个汉堡多少钱？(列方程解答)
<gadget id="calculator">50 - 38</gadget>
<output>12</output>

<result>12</result>