There are 300 books on the two bookshelves A and B. The number of books on the B bookshelf is (2/3) that on the A bookshelf. How many books are there on the A bookshelf?
甲、乙两个书架上共有300本书，乙书架上的书的本数是甲书架上的(2/3)，甲书架上有书多少本？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">300 * (3/5)</gadget>
<output>180</output>

<result>180</result>