What is the probability of drawing a white ball from a box containing 1 white ball and 7 red balls?
从放有1个白球和7个红球的箱子里摸到白球的可能性是多少．
<gadget id="calculator">1 + 7</gadget>
<output>8</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>