Split 54 into the sum of four numbers A, B, C, and D, so that A+2=B-2=C*2=D/2, then A=how much.
把54拆成A、B、C、D四个数的和，使得A+2=B-2=C*2=D/2，则A=多少．
<gadget id="calculator">54 - 2</gadget>
<output>52</output>

<gadget id="calculator">2 + 52</gadget>
<output>54</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + 1 + (1/2) + 2</gadget>
<output>9/2 = around 4.5</output>

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

<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<result>10</result>