Xiaoqing planned to finish reading a storybook in 9 days, but because she read 6 more pages every day, she ended up reading it in 6 days. How many pages does the storybook have?
小青计划9天看完一本故事书，由于每天多看6页，结果6天就看完了，这本故事书共有多少页．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/6) - (1/9)</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">6 / (1/18)</gadget>
<output>108</output>

<result>108</result>