There are 4 red balls and 2 white balls in a bag. If one ball is drawn from the bag, what is the probability of drawing a red ball?
一个袋子里有4个红球和2个白球，从袋子里摸出1个球，摸出红球的可能性是多少．
<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">4 / 6</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>