Mom bought 2.5 kilograms of cucumbers in the supermarket, and after giving 10 yuan to the salesperson, the cucumber is 3.4 yuan per kilogram. How much should I get back?
妈妈在超市买了2.5千克黄瓜，交给售货员10元钱后，每千克黄瓜3.4元，应找回多少元？
<gadget id="calculator">3.4 * 2.5</gadget>
<output>8.5</output>

<gadget id="calculator">10 - 8.5</gadget>
<output>1.5</output>

<result>1.5</result>