There are 10 yellow balls and 6 white balls in the box, and how many white balls are put in, the probability of touching yellow balls and white balls is equal.
盒子里有10个黄球6个白球，再放入多少个白球，摸到黄球和白球可能性相等．
<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<result>4</result>