Mom bought 4 glasses, paid a total of 12 yuan, got back 4.8 yuan, how much is each glass?
妈妈买了4个玻璃杯，共付了12元，找回4.8元，每个玻璃杯多少钱？
<gadget id="calculator">12 - 4.8</gadget>
<output>7.2</output>

<gadget id="calculator">7.2 / 4</gadget>
<output>1.8</output>

<result>1.8</result>