The bottle contains 1000 grams of alcohol with a concentration of 15%. Now pour 100 grams and 400 grams of alcohol A and B into the bottle respectively, and the concentration of alcohol in the bottle will become 14%. The concentration of alcohol A is known. It is twice the alcohol of type B, what is the concentration of alcohol of type A?
瓶中装有浓度为15%的酒精1000克，现分别将100克400克的A、B两种酒精倒入瓶中，则瓶中酒精的浓度变为14%，已知A种酒精的浓度是B种酒精的2倍，求A种酒精的浓度？
<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>