Buying 5 kilograms of bananas and 4 kilograms of apples costs 31.90 yuan. It is known that the price of bananas per kilogram is 3.5 yuan. How much is it per kilogram of apples? (Solution of column equation)
买5千克香蕉和4千克苹果共用31.90元，已知每千克香蕉售价是3.5元，每千克苹果多少元？(列方程解)
<gadget id="calculator">5 * 3.5</gadget>
<output>17.5</output>

<gadget id="calculator">31.9 - 17.5</gadget>
<output>14.4</output>

<gadget id="calculator">14.4 / 4</gadget>
<output>3.6</output>

<result>3.6</result>