How many tiles are needed to decorate a wall with a length of 5 meters and a width of 4 meters with tiles with a side length of 0.8 decimeters?
用边长0.8分米的瓷砖装饰一面长5米、宽4米的墙壁，至少需要多少块这样的瓷砖？
<gadget id="calculator">0.8 / 10</gadget>
<output>0.08</output>

<gadget id="calculator">0.08 * 0.08</gadget>
<output>0.0064</output>

<gadget id="calculator">4 / 0.0064</gadget>
<output>625</output>

<gadget id="calculator">5 * 625</gadget>
<output>3_125</output>

<result>3_125</result>