Mom brought 50 yuan to the market to buy vegetables. First buy 1.5 kilograms of cucumbers, pay 10 yuan, get back 2.5 yuan, how much is the cucumber sold per kilogram?
妈妈带了50元钱到市场买菜．先买了1.5千克黄瓜，付出10元，找回2.5元，黄瓜每千克卖多少钱？
<gadget id="calculator">10 - 2.5</gadget>
<output>7.5</output>

<gadget id="calculator">7.5 / 1.5</gadget>
<output>5</output>

<result>5</result>