Mom bought 8 kilograms of apples and 8 kilograms of oranges, paid 35 yuan, got back 3 yuan, 2.5 yuan per kilogram of apples, how much per kilogram of oranges did mother buy?
妈妈买回苹果和橘子各8千克，付出35元，找回3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">2.5 * 8</gadget>
<output>20</output>

<gadget id="calculator">35 - 3 - 20</gadget>
<output>12</output>

<gadget id="calculator">12 / 8</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>