It takes 500 pieces to lay floor tiles with a side length of 4 decimeters on the floor of a small meeting room. Now use floor tiles with a side length of 5 decimeters, how many pieces are needed? (Solve with ratio)
在一间小会议室的地面上铺边长为4分米的地砖，需500块．现改用边长为5分米的地砖铺，需要多少块？(用比例解)
<gadget id="calculator">4 * 4 * 500</gadget>
<output>8_000</output>

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

<gadget id="calculator">8_000 / 25</gadget>
<output>320</output>

<result>320</result>