Teacher Li's room needs to be renovated. If you need 500 pieces of square bricks with a side length of 3 decimeters to pave the ground, how many pieces are needed if you use square bricks with a side length of 5 decimeters instead?
李老师的房间要装修．如果用边长是3分米的方砖铺地面需要500块，如果改用边长是5分米的方砖铺，需要多少块？
<gadget id="calculator">3 * 3 * 500</gadget>
<output>4_500</output>

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

<gadget id="calculator">4_500 / 25</gadget>
<output>180</output>

<result>180</result>