Make 7 bookmarks out of a 2 decimeter long plastic board, how many decimeter plastic boards are used for each bookmark?
把2分米长的塑料板做成7个书签，平均每个书签用多少分米塑料板？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>