There are 7 yellow ping-pong balls and 3 white ping-pong balls in the bag. Shake it and draw a ball randomly. What is the probability of getting a white ping-pong ball?
袋子中放着7个黄色乒乓球和3个白色乒乓球，摇一摇，任意摸出一个球，摸到白色乒乓球的可能性是多少
<gadget id="calculator">3 + 7</gadget>
<output>10</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>