The shape of the bottom of the pool in the water park is rectangular, 100 meters long and 50 meters wide. If you want to pave the floor with square bricks with a side length of 20 cm, how many such square bricks are needed?
水上乐园水池底部的形状是长方形，长100米，宽50米．如果要用边长是20厘米的方砖铺地，需要这样的方砖多少块？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * (1/5)</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">50 / (1/25)</gadget>
<output>1_250</output>

<gadget id="calculator">100 * 1_250</gadget>
<output>125_000</output>

<result>125_000</result>