Pave a classroom with square bricks. If you use square bricks with a side length of 4 decimeters to pave the floor, you need to use 500 pieces. If you use square bricks with a side length of 5 decimeters instead, how many square bricks are needed? (Solve with ratio)
用方砖给一间教室铺地．如果用边长4分米的方砖铺地，需要用500块．如果改用边长5分米的方砖来铺，需方砖多少块？(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>