A cuboid glass fish tank, measured from the inside, is (4/5) meters long, (1/2) meters wide, and (1/5) meters high. If 20 liters of water are poured into the glass tank, what is the water depth in centimeters?
一个长方体玻璃鱼缸，从里面量，长(4/5)米，宽(1/2)米，高(1/5)米，如果将20升水倒入玻璃缸中，水深多少厘米．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(4/5) * (1/2)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 / 1_000 / (2/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 100</gadget>
<output>5</output>

<result>5</result>