Customer: "I want one can of fruit milk and four cans of Coke." Salesperson: "One can of Coke is 0.5 yuan more than one can of fruit milk. I charge you 20 yuan, and I will give you 3 yuan. Please find it according to the dialogue equation How much is a can of fruit milk?"
顾客："我要一听果奶和四听可乐．"售货员："一听可乐比一听果奶多0.5元，我收了你20元钱，找给你3元．请根据对话列方程求出1听果奶多少钱？"
<gadget id="calculator">4 * 0.5</gadget>
<output>2</output>

<gadget id="calculator">20 - 2 - 3</gadget>
<output>15</output>

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<result>3</result>