There are 6 white balls and 4 red balls in a box, what is the probability that a ball is drawn from the box is red
盒子里有6个白球和4个红球，从盒子里摸出一个球，是红色球的可能性是多少
<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>