Mr. Wang bought back 45kg of apples and 20kg of pears and paid a total of 54.2 yuan. Later, he returned 10kg of pears in exchange for 15kg of apples and paid another 7.40 yuan. How much is per kilogram of apples?
王老师买回45千克苹果和20千克梨共付人民币54.2元，后来退还10千克梨换回15千克苹果又付了7.40元，问每千克苹果多少元？
<gadget id="calculator">7.4 * 2</gadget>
<output>14.8</output>

<gadget id="calculator">54.2 + 14.8</gadget>
<output>69</output>

<gadget id="calculator">45 + 15 + 15</gadget>
<output>75</output>

<gadget id="calculator">69 / 75</gadget>
<output>23/25 = around 0.92</output>

<result>23/25 = around 0.92</result>