Put 7 red pencils and 3 blue pencils in a bag, and let you pick out one at a time, so that you touch 10,000 times, how many red pencils will you get?
把7支红铅笔和3支蓝铅笔放在一个包里，让你每次任意摸出1支，这样摸10000次，摸出红铅笔大约会有多少支．
<gadget id="calculator">7 + 3</gadget>
<output>10</output>

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

<gadget id="calculator">10_000 * (7/10)</gadget>
<output>7_000</output>

<result>7_000</result>