Three brothers jointly bought a "Chinese Dictionary", in which the money paid by the eldest was equal to (5/7) of the other two, and the money paid by the second was equivalent to (1/2) of the other two, which was higher than that of the third. If there is an extra 5.5 yuan, ask for the unit price of "Chinese Dictionary".
兄弟三人合买一本《中华大辞典》，其中老大出的钱相等于其余二人的(5/7)，老二出的钱相当于其余二人的(1/2)，比老三多出5.5元，求《中华大辞典》单价．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 + 7</gadget>
<output>12</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 - (5/12) - (1/3)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/3) - (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">5.5 / (1/12)</gadget>
<output>66</output>

<result>66</result>