A square is paved with square bricks. If you use square bricks with an area of 4dm**2, you need 2000 pieces; if you use square bricks with an area of 5dm**2, how many pieces are needed? (Solve with ratio)
一个广场用方砖铺地．如果用面积是4dm**2的方砖，需要2000块；如果改用面积是5dm**2的方砖，需要多少块？(用比例解)
<gadget id="calculator">4 * 2_000</gadget>
<output>8_000</output>

<gadget id="calculator">8_000 / 5</gadget>
<output>1_600</output>

<result>1_600</result>