Mom bought 2 kilograms of oranges and 4 kilograms of apples. My aunt bought the same 2kg of oranges and 6kg of apples. My aunt paid the salesperson 6 yuan more than my mother. Ask how much an apple is per kilogram.
妈妈买了桔子2千克和苹果4干克．婶婶买了同样的桔子2千克和苹果6千克．婶婶比妈妈多付给营业员6元．问苹果每千克多少元．
<gadget id="calculator">6 - 4</gadget>
<output>2</output>

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

<result>3</result>