Students carry out recycling activities for used books. A total of 340 kilograms of used books were recycled, and the recycling rate of recycled paper produced from used books was 75%. How many kilograms of recycled paper can these recycled used books produce?
同学们开展废旧图书回收活动．共回收废旧图书340千克，用废旧图书生产再生纸的再生率为75%，这些回收的废旧图书能生产多少千克的再生纸？
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">340 * (3/4)</gadget>
<output>255</output>

<result>255</result>