To pave a room with square bricks, it takes 800 square bricks with an area of 4 square decimeters, and how many square bricks with an area of 16 square decimeters are needed? (proportional solution)
用方砖铺一间房间，用面积4平方分米的方砖需要800块，改用面积是16平方分米方砖，需要多少块？(比例解)
<gadget id="calculator">4 * 800</gadget>
<output>3_200</output>

<gadget id="calculator">3_200 / 16</gadget>
<output>200</output>

<result>200</result>