Mom bought 4 kg of apples and 3 kg of oranges with 50 yuan, and got back 21.4 yuan. It is known that the price of oranges per kilogram is 3.2 yuan. How much is the price of apples per kilogram?
妈妈带50元买4千克苹果和3千克橘子，找回21.4元，已知每千克橘子售价3.2元，每千克苹果售价多少元？
<gadget id="calculator">3 * 3.2</gadget>
<output>9.6</output>

<gadget id="calculator">50 - 9.6 - 21.4</gadget>
<output>19</output>

<gadget id="calculator">19 / 4</gadget>
<output>19/4 = around 4.75</output>

<result>19/4 = around 4.75</result>