Shanggang Primary School bought 450 comic books, which is 25% less than the literary books bought. How many literary books were bought?
上岗小学买来连环画450本，比买来的文艺书少25%，买来文艺书多少本？
<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">450 / (3/4)</gadget>
<output>600</output>

<result>600</result>