Mom goes to the supermarket to buy 2.5 kilograms of apples and 2.5 kilograms of pears, and the total cost is 30.5 yuan. The apples are 5 yuan per kilogram. How much is the pear per kilogram? (column equation solution)
妈妈去超市买苹果和梨各2.5千克，共用去30.5元，苹果每千克5元，梨每千克多少元？(列方程解答)
<gadget id="calculator">5 * 2.5</gadget>
<output>12.5</output>

<gadget id="calculator">30.5 - 12.5</gadget>
<output>18</output>

<gadget id="calculator">18 / 2.5</gadget>
<output>7.2</output>

<result>7.2</result>