Read a 300-page storybook, read 20% of the whole book for the first time, and 25% of the whole book for the second time, how many pages did you read in total?
读一本300页的故事书，第一次读了全书的20%，第二次读了全书的25%，两次共读了多少页？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/5) + (1/4)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">300 * (9/20)</gadget>
<output>135</output>

<result>135</result>