Distribute the cards to A, B, and C in a ratio of 3:2:4. If A gets 12 cards, how many cards does C get.
把卡片按3：2：4的比例分给甲乙丙三个人，如果甲得12张，丙得多少张．
<gadget id="calculator">3 + 2 + 4</gadget>
<output>9</output>

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">12 / (1/3)</gadget>
<output>36</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">36 * (4/9)</gadget>
<output>16</output>

<result>16</result>