The ratio of the number of science and technology books in the book corner of a certain class is 1:8. Later, the students bought 5 story books, so the ratio of the number of story books to technology books is 1:4. How many books did the book corner originally have?
某班图书角故事书科技的数量比是1：8，后来同学们买来5本故事书，于是故事书与科技书的数量比是1：4．图书角原来共有图书多少本？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/4) - (1/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">5 / (1/8)</gadget>
<output>40</output>

<gadget id="calculator">40 * (1/8)</gadget>
<output>5</output>

<gadget id="calculator">40 + 5</gadget>
<output>45</output>

<result>45</result>