To lay floor tiles for a conference room, it costs 250 pieces to use square bricks with a side length of 4 decimeters. If you use square bricks with a side length of 5 decimeters instead, how many pieces do you need? (Solution with proportional knowledge)
给一个会议室铺地砖，用边长4分米方砖要250块，如果改用边长5分米的方砖来铺，需要多少块？(用比例知识解)
<gadget id="calculator">4 * 4 * 250</gadget>
<output>4_000</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">4_000 / 25</gadget>
<output>160</output>

<result>160</result>