Dad bought 7.5 kilograms of beans at the market, paid the salesperson 15 yuan and got back 3 yuan, how much is it per kilogram of beans?
爸爸在市场买了7.5千克豆角，付给售货员15元后找回3元，每千克豆角多少钱？
<gadget id="calculator">15 - 3</gadget>
<output>12</output>

<gadget id="calculator">12 / 7.5</gadget>
<output>1.6</output>

<result>1.6</result>