The ratio of the three numbers A, B, and C is 1:2:3, and their average is 42. What is the number C?
甲乙丙三个数的比为1：2：3，它们的平均数为42，那么丙数是多少．
<gadget id="calculator">42 * 3</gadget>
<output>126</output>

<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">126 * (1/2)</gadget>
<output>63</output>

<result>63</result>