There are 8 red balls and 2 white balls in a bag, and all the balls are the same except for their color. What is the probability that a ball randomly drawn from the bag is red?
一个袋中有8个红球2个白球，每个球除颜色外都相同，从袋中任意摸出一个球是红色的可能性是多少．
<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<gadget id="calculator">8 / 10</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>