The ratio of the number A to the sum of the numbers B and C is 1:8, the ratio of the number C to the sum of the numbers A and B is 5:4, the number B is 12 more than the number A, and the ratio of the numbers A, B, and C and how much?
甲数与乙、丙两数之和的比是1：8，丙数与甲、乙两数之和的比是5：4，乙数比甲数多12，甲、乙、丙三数之和是多少？
<gadget id="calculator">8 / 1</gadget>
<output>8</output>

<gadget id="calculator">1 + 8</gadget>
<output>9</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (1/9) - (5/9) - (1/9)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">12 / (2/9)</gadget>
<output>54</output>

<result>54</result>