Bottle A contains twice as much wine as bottle B. If you pour 250 grams of wine from bottle A into bottle B, the two bottles will have the same amount of wine. How many grams of wine does bottle A contain?
甲瓶所盛的酒比乙瓶多2倍，从甲瓶倒250克酒到乙瓶，两瓶酒就同样多，甲瓶原来有酒多少克．
<gadget id="calculator">250 * 2</gadget>
<output>500</output>

<gadget id="calculator">500 / 2</gadget>
<output>250</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">250 * 3</gadget>
<output>750</output>

<result>750</result>