Xiaohong reads 25% of a storybook, and there are 120 pages left. How many pages does Xiaohong read?
小红看一本故事书已经看了25%，还剩120页，小红看了多少页？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 / (3/4)</gadget>
<output>160</output>

<gadget id="calculator">160 - 120</gadget>
<output>40</output>

<result>40</result>