Aunt Li bought 3kg of apples, cores and pears, and the total cost was 20.10 yuan. The apples cost 3.6 yuan per kilogram. How much is the pear per kilogram? (column equation solution)
李阿姨买了苹果核梨各3kg，一共用了20.10元，苹果每千克3.6元，请问梨每千克多少元？(列方程解答)
<gadget id="calculator">3.6 * 3</gadget>
<output>10.8</output>

<gadget id="calculator">20.1 - 10.8</gadget>
<output>9.3</output>

<gadget id="calculator">9.3 / 3</gadget>
<output>3.1</output>

<result>3.1</result>