There are 6 yellow balls and several white balls in a pocket, except that they are of the same color, if one ball is drawn randomly, the probability of drawing a yellow ball is (2/3). How many fewer white balls than yellow balls?
口袋中有6个黄球和若干个白球，它们除颜色完全相同，从中任意摸出一球，摸出黄球的可能性是(2/3)．则白球比黄球少多少个．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">6 / (2/3)</gadget>
<output>9</output>

<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<gadget id="calculator">6 - 3</gadget>
<output>3</output>

<result>3</result>