The ratio of the three numbers A, B, and C is 1:2:3. The sum of the three numbers is 60. What is A?
甲乙丙三个数之比是1：2：3，三个数的和是60，甲是多少．
<gadget id="calculator">1 + 2 + 3</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">30 * (1/6)</gadget>
<output>5</output>

<result>5</result>