There are a number of black balls and white balls of the same number in the box. Now put 14 more balls into the box (only black balls and white balls). At this time, the number of black balls accounts for (1/6) of the total number of balls. Now How many white balls are there in the box.
箱子里装有若干个相同数量的黑球和白球，现往箱子里再放入14个球(只有黑球和白球)，这时黑球数量占球的总数的(1/6)，那么现在箱子里有多少个白球．
<gadget id="calculator">2 + 13</gadget>
<output>15</output>

<result>15</result>