A fraction is divided into (1/7), the sum of the numerator and denominator of the original fraction is 72, what is the original fraction.
一个分数约分后是(1/7)，原分数的分子和分母之和是72，原分数是多少．
<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">72 * (7/8)</gadget>
<output>63</output>

<gadget id="calculator">(1/8) / 63</gadget>
<output>1/504 = around 0.001984</output>

<gadget id="calculator">72 * (1/504)</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>