The sum of the three numbers A, B, and C is 60, and their ratio is 2:3:5, so what is the number A?
甲、乙、丙三个数的和是60，它们的比是2：3：5，那么甲数是多少．
<gadget id="calculator">2 + 3 + 5</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">60 * (1/5)</gadget>
<output>12</output>

<result>12</result>