Mom buys 5 kilograms of apples and 5 kilograms of oranges, pays 25 yuan, gets back 4.5 yuan, 2.5 yuan per kilogram of apples, how much is the oranges that mother bought per kilogram?
妈妈买回苹果和橘子各5千克，付出25元，找回4.5元，每千克苹果2.5元，那妈妈买的橘子每千克多少元？
<gadget id="calculator">5 * 2.5</gadget>
<output>12.5</output>

<gadget id="calculator">25 - 12.5 - 4.5</gadget>
<output>8</output>

<gadget id="calculator">8 / 5</gadget>
<output>8/5 = around 1.6</output>

<result>8/5 = around 1.6</result>