Mom bought 6 kilograms of oranges at 3.8 yuan per kilogram, leaving 7.72 yuan. How much money did she have?
妈妈买了6千克橘子，每千克3.8元，还剩7.72元，她原来有多少钱？
<gadget id="calculator">3.8 * 6</gadget>
<output>22.8</output>

<gadget id="calculator">22.8 + 7.72</gadget>
<output>30.52</output>

<result>30.52</result>