A bottle of alcohol, when half of the alcohol is used, the weight of the bottle is 700 grams. If only 1/3 of the alcohol is used, the weight of the bottle is 800 grams. How much is the bottle of alcohol?
一瓶酒精，当用去酒精的一半后，连瓶重700克，如果只用去酒精的(1/3)，则连瓶共重800克，这瓶酒精多少克？
<gadget id="calculator">800 - 700</gadget>
<output>100</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(2/3) - (1/2)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">100 / (1/6)</gadget>
<output>600</output>

<result>600</result>