Mom bought 3 kilograms of apples and 5 kilograms of pears, and spent a total of 40.5 yuan. It is known that apples are 6.5 yuan per kilogram. How much is pears per kilogram? (solution by equation)
妈妈买了3千克苹果和5千克梨，共花了40.5元，已知苹果每千克6.5元，梨每千克多少元？(用方程解)
<gadget id="calculator">6.5 * 3</gadget>
<output>19.5</output>

<gadget id="calculator">40.5 - 19.5</gadget>
<output>21</output>

<gadget id="calculator">21 / 5</gadget>
<output>21/5 = around 4.2</output>

<result>21/5 = around 4.2</result>