(1/7) of a number is 2 more than its (1/8), find this number.
一个数的(1/7)比它的(1/8)多2，求这个数．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

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

<gadget id="calculator">(1/7) - (1/8)</gadget>
<output>1/56 = around 0.017857</output>

<gadget id="calculator">2 / (1/56)</gadget>
<output>112</output>

<result>112</result>