There are 60 more books on shelf A than on shelf B. It is known that the number of books on shelf A accounts for 60% of the total. How many books are there in the bookshelves A and B?
甲书架上的书比乙书架上的书多60本，已知甲书架上的书的本数占总数的60%．甲、乙两个书架共有多少本书？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">60 / (1/5)</gadget>
<output>300</output>

<result>300</result>