The kindergarten bought 6 kilograms of apples and 6 kilograms of oranges, and the total cost was 22.8 yuan. It is known that apples are 2.5 yuan per kilogram. How much are oranges per kilogram?
幼儿园买回苹果和橘子各6千克，共用去22.8元，已知苹果每千克2.5元，橘子每千克多少元？
<gadget id="calculator">2.5 * 6</gadget>
<output>15</output>

<gadget id="calculator">22.8 - 15</gadget>
<output>7.8</output>

<gadget id="calculator">7.8 / 6</gadget>
<output>1.3</output>

<result>1.3</result>