There are 12 balls in the pocket. If you touch any ball from it, the probability of getting a red ball is (3/4). How many red balls are there in the pocket?
口袋里有12个球，从里面任意摸一个球，摸到红球的可能性为(3/4)，口袋里可能有多少个红球．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">12 * (3/4)</gadget>
<output>9</output>

<result>9</result>