Mom bought 6.5 kilograms of apples and bananas from the supermarket, and paid 50 yuan in total. The apples were 12 yuan per kilogram, and the bananas were 5 yuan per kilogram. How many kilograms of apples did she buy?
妈妈从超市买了苹果、香蕉共6.5千克，共付款50元，苹果每千克12元，香蕉每千克5元，妈妈买了多少千克苹果．
<gadget id="calculator">5 * 6.5</gadget>
<output>32.5</output>

<gadget id="calculator">50 - 32.5</gadget>
<output>17.5</output>

<gadget id="calculator">12 - 5</gadget>
<output>7</output>

<gadget id="calculator">17.5 / 7</gadget>
<output>2.5</output>

<result>2.5</result>