There are 3 white balls and 7 blue balls of the same size in a bag. If one ball is drawn from it, what is the probability of drawing a blue ball?
袋子里有3个白球和7个蓝球，大小相同，从中摸出一个球，则摸出蓝球的可能性是多少．
<gadget id="calculator">3 + 7</gadget>
<output>10</output>

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

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