The bottle contains 1000 grams of alcohol solution with an alcohol content of 15%, and now 100 grams and 400 grams of A and B alcohol solutions are poured in respectively, and the alcohol content in the bottle becomes 14%. It is known that the alcohol content of alcohol solution A is twice that of alcohol B. Find the content of alcohol solution A.
瓶子里装有酒精含量为15%的酒精溶液1000克，现在又分别倒入100克和400克的A、B两种酒精溶液，瓶子里的酒精含量变为14%．已知A种酒精溶液的酒精含量是B酒精含量的2倍．求A种酒精溶液的含量．
<gadget id="calculator">14 / 100</gadget>
<output>7/50 = around 0.14</output>

<gadget id="calculator">1_000 + 100 + 400</gadget>
<output>1_500</output>

<gadget id="calculator">(7/50) * 1_500</gadget>
<output>210</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) * 1_000</gadget>
<output>150</output>

<gadget id="calculator">210 - 150</gadget>
<output>60</output>

<gadget id="calculator">400 / 2</gadget>
<output>200</output>

<gadget id="calculator">100 + 200</gadget>
<output>300</output>

<gadget id="calculator">60 / 300</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(1/5) * 1</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>