The average of the three numbers A, B, and C is 6. Their ratio is 1:2:3, so how much less A is than C.
甲、乙、丙三个数的平均数是6．它们的比是1：2：3，那么甲比丙少多少．
<gadget id="calculator">1 + 2 + 3</gadget>
<output>6</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">6 * (1/2)</gadget>
<output>3</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 6</gadget>
<output>12</output>

<result>12</result>