A, B, and C are three numbers. A is the sum of B and C (4/11), B is the sum of A and C (1/2), and C is 12. Find the sum of the three numbers of A, B, and C ．
A，B，C三个数，A是B、C总和的(4/11)，B是A、C总和的(1/2)，C是12，求A，B，C三个数的和．
<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">180 / 18</gadget>
<output>10</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">20 - 12</gadget>
<output>8</output>

<gadget id="calculator">8 + 10 + 12</gadget>
<output>30</output>

<result>30</result>