Mom bought 1.4 kg of apples and 2.5 kg of bananas from the store, and spent a total of 16.4 yuan. It is known that bananas are 4.6 yuan per kilogram, how much is apples per kilogram?
妈妈从商店买回1.4千克苹果和2.5千克香蕉，共花去16.4元．已知香蕉每千克4.6元，每千克苹果多少元？
<gadget id="calculator">4.6 * 2.5</gadget>
<output>11.5</output>

<gadget id="calculator">16.4 - 11.5</gadget>
<output>4.9</output>

<gadget id="calculator">4.9 / 1.4</gadget>
<output>3.5</output>

<result>3.5</result>