The number of picture books in the book corner is 3/4 of the science books, and 40% less than the story books. There are 120 known science books, but how many story books are there?
图书角里连环画册的本数是科技书的(3/4)，又比故事书少40%，已知科技书有120本，故事书有多少本？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/4) / (3/5)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">120 * (5/4)</gadget>
<output>150</output>

<result>150</result>