If a conference room is paved with square bricks, 16dm**2 square bricks need 400 pieces; if it is replaced with 25dm**2 square bricks, how many pieces do you need? (Solved by proportional method)
一个会议室用方砖铺地，用16dm**2的方砖铺，需要400块；如果改用25dm**2的方砖铺，需要多少块？(用比例方法解决)
<gadget id="calculator">16 * 400</gadget>
<output>6_400</output>

<gadget id="calculator">6_400 / 25</gadget>
<output>256</output>

<result>256</result>