Mom bought 3 kilograms of pears and 4 kilograms of apples, and they shared 23.3 yuan, 3.5 yuan per kilogram of apples, how much is it per kilogram of pears? (solution by equation)
妈妈买了3千克梨和4千克苹果，共用去23.3元，每千克苹果3.5元，每千克梨多少元？(用方程解)
<gadget id="calculator">4 * 3.5</gadget>
<output>14</output>

<gadget id="calculator">23.3 - 14</gadget>
<output>9.3</output>

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

<result>3.1</result>