Aunt Wang went to the supermarket to buy apples and oranges and spent a total of 47.6 yuan. The apples were 6.5 yuan per kilogram, and the oranges were 7.2 yuan per kilogram. Aunt Wang bought 4 kilograms of apples. How many kilograms of oranges did she buy?
王大妈到超市买苹果和桔子一共花了47.6元，苹果每千克6.5元，桔子每千克7.2元，王大妈买了4千克苹果，买了多少千克桔子？
<gadget id="calculator">4 * 6.5</gadget>
<output>26</output>

<gadget id="calculator">47.6 - 26</gadget>
<output>21.6</output>

<gadget id="calculator">21.6 / 7.2</gadget>
<output>3</output>

<result>3</result>