Two containers, A and B, are filled with 600 grams and 500 grams of salt water respectively, and the concentration ratio is 2:1. After adding 500 grams of water to container B, pour part of the salt water in container B into container A, and then add water to both containers to make them both 1000 grams. At this time, the concentration ratio of the salt water in container A and container B is 14:3 , then how many grams of brine is poured into container A from container B?
甲、乙两个容器内分别装有盐水600克、500克，其浓度比值为2：1．在乙容器中加入500克水后，将乙容器的盐水倒一部分给甲容器，再在两容器内加水，使他们均为1000克，这时甲、乙容器内的盐水浓度比为14：3，那么乙容器倒入甲容器的盐水有多少克？
<gadget id="calculator">17 / 2</gadget>
<output>17/2 = around 8.5</output>

<gadget id="calculator">3_400 / (17/2)</gadget>
<output>400</output>

<result>400</result>