If you randomly touch balls in a bag containing 7 red balls, 2 green balls and 1 yellow ball, what is the probability of getting a red ball?
随意在装有7个红球、2个绿球和1个黄球的袋子里摸球，摸到红球的可能性是多少
<gadget id="calculator">7 + 2 + 1</gadget>
<output>10</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>