A batch of paper, used to print a book of 80 pages, is just enough to print 6000 copies. Double the paper and use it to print a 240-page book, how many copies can be printed?
一批纸张，用来印刷80页的书，刚好够印6000册．纸张增加1倍，用来印刷240页的书，能够印多少册？
<gadget id="calculator">2 / 240</gadget>
<output>1/120 = around 0.008333</output>

<gadget id="calculator">80 * 6_000 * (1/120)</gadget>
<output>4_000</output>

<result>4_000</result>