Mom buys 3 kilograms of apples and 3 kilograms of oranges, pays 15 yuan, gets back 4.5 yuan, 1.5 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3千克，付出15元，找回4.5元，每千克苹果1.5元，那妈妈买的橘子每千克多少元？
<gadget id="calculator">15 - 4.5</gadget>
<output>10.5</output>

<gadget id="calculator">1.5 * 3</gadget>
<output>4.5</output>

<gadget id="calculator">10.5 - 4.5</gadget>
<output>6</output>

<gadget id="calculator">6 / 3</gadget>
<output>2</output>

<result>2</result>