The collection of books in my country's library is far below the average collection of books in the world. There are about 400 million volumes in my country, and the average volume per person is about (3/10), which is only 3/20 of the world's average level. The average collection of books per person in the world is about For how many volumes?
我国图书馆的藏书量远远低于世界平均藏书量，我国约4亿册，平均每人约(3/10)册，只有世界平均水平的(3/20)，世界平均每人藏书量约为多少册？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/10) / (3/20)</gadget>
<output>2</output>

<result>2</result>