There are two packaging specifications for a beverage. The capacity of the large bottle is 1.5 liters, which is three times the capacity of the small bottle. The unit price of the small bottle is 1.8 yuan, which is 3.2 yuan cheaper than the big bottle. Ask yourself questions and solve equations.
一种饮料有两种包装规格，大瓶容量1.5升，是小瓶容量的3倍．小瓶的单价是1.8元，比大瓶便宜3.2元．自己提出问题并列方程解答．
<gadget id="calculator">1.8 + 3.2</gadget>
<output>5</output>

<result>5</result>