The mass of a bottle of beverage is 850 grams. If half of it is drunk, the mass of the entire bottle is 500 grams. How many grams of beverage was originally contained in the bottle?
一瓶饮料连瓶的质量是850克，喝了一半，连瓶的质量是500克，瓶中原来装了多少克饮料？
<gadget id="calculator">850 - 500</gadget>
<output>350</output>

<gadget id="calculator">350 * 2</gadget>
<output>700</output>

<result>700</result>