Xiaodong bought 4 AA batteries and paid 10 yuan, and got back 2.4 yuan. How much is each AA battery? (Solution of column equation)
小冬买了4节五号电池付了10元钱，找回2.4元，每节五号电池多少元？(列方程解)
<gadget id="calculator">10 - 2.4</gadget>
<output>7.6</output>

<gadget id="calculator">7.6 / 4</gadget>
<output>1.9</output>

<result>1.9</result>