Mom buys 4 boxes of milk and 1.2 kg of apples and the cost is 10.4 yuan. The milk is 1.1 yuan per box. How much is the apple per kilogram?
妈妈买了4盒牛奶和1.2千克苹果共用了10.4元，牛奶每盒1.1元，苹果每千克多少元？
<gadget id="calculator">1.1 * 4</gadget>
<output>4.4</output>

<gadget id="calculator">10.4 - 4.4</gadget>
<output>6</output>

<gadget id="calculator">6 / 1.2</gadget>
<output>5</output>

<result>5</result>