A bottle of beverage is 1.25 liters, and after drinking some, there is 0.75 liters left. How many liters did you drink?
一瓶饮料1.25升，喝了一些后还剩0.75升．喝了多少升？
<gadget id="calculator">1.25 - 0.75</gadget>
<output>0.5</output>

<result>0.5</result>