Buying 4 kg of pears and 6 kg of apples costs 39.8 yuan. It is known that pears are 3.2 yuan per kilogram. How much is the price of apples per kilogram?
买4千克梨和6千克苹果共用去39.8元，已知梨每千克3.2元，求苹果每千克多少元？
<gadget id="calculator">3.2 * 4</gadget>
<output>12.8</output>

<gadget id="calculator">39.8 - 12.8</gadget>
<output>27</output>

<gadget id="calculator">27 / 6</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>