For a fraction, the sum of the numerator and denominator is 16, and the denominator is 2 greater than the numerator. What is the fraction?
一个分数，分子、分母的和是16，分母比分子大2，这个分数是多少．
<gadget id="calculator">16 + 2</gadget>
<output>18</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">16 - 9</gadget>
<output>7</output>

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<result>7/9 = around 0.777778</result>