4 kg of apples is 2.1 yuan more expensive than 5 kg of oranges. Apples are 2.4 yuan per kilogram, how much are oranges per kilogram? (solution by equation)
4千克苹果比5千克橘子贵2.1元．苹果每千克2.4元，橘子每千克多少元？(用方程解)
<gadget id="calculator">2.4 * 4</gadget>
<output>9.6</output>

<gadget id="calculator">9.6 - 2.2</gadget>
<output>7.4</output>

<gadget id="calculator">7.4 / 5</gadget>
<output>1.48</output>

<result>1.48</result>