The average of the three numbers A, B, and C is 4, and their ratio is (2/3): (5/6): (1/2). What is the smallest number?
甲乙丙三个数的平均数是4，它们的比是(2/3)：(5/6)：(1/2)，最小的数是多少．
<gadget id="calculator">4 + 5 + 3</gadget>
<output>12</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">4 * 3 * (1/4)</gadget>
<output>3</output>

<result>3</result>