Mom bought 2 kilograms of apples and 2 kilograms of pears. The total cost was 15.6 yuan. The apples were 2.4 yuan per kilogram. How much is the pear per kilogram? (required to be solved by equation)
妈妈买了苹果和梨各2千克，共花了15.6元，苹果每千克2.4元，梨每千克多少元？(要求必须用方程解)
<gadget id="calculator">2.4 * 2</gadget>
<output>4.8</output>

<gadget id="calculator">15.6 - 4.8</gadget>
<output>10.8</output>

<gadget id="calculator">10.8 / 2</gadget>
<output>5.4</output>

<result>5.4</result>