A sidewalk is 500 meters long and 8 meters wide, and it is paved with cement square bricks with a side length of 4 decimeters. How many bricks are needed to cover it?
一条人行道长500米，宽8米，用边长4分米的水泥方砖铺地，铺满需多少块．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">100 / 16</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">500 * 8 * (25/4)</gadget>
<output>25_000</output>

<result>25_000</result>