To pave the floor of a house, 820 square bricks with a side length of 2 decimeters are needed. How many square bricks with a side length of 4 decimeters are used instead? (Use ratio to get full marks)
铺一间房屋的地面，用边长2分米的方砖需要820块，如果改用边长4分米的方砖需要多少块？(用比例解得满分)
<gadget id="calculator">2 * 2 * 820</gadget>
<output>3_280</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">3_280 / 16</gadget>
<output>205</output>

<result>205</result>