A cuboid fish tank measures 60cm in length, 30cm in width and 40cm in height from the inside. The water surface in the tank is 5cm away from the mouth of the tank. How many liters of water is there in the tank?
一个长方体鱼缸，从里面量得长60cm，宽30cm，高40cm，缸内的水面离缸口5cm，鱼缸内的现在共有水多少升？
<gadget id="calculator">40 - 5</gadget>
<output>35</output>

<gadget id="calculator">35 / 1_000</gadget>
<output>7/200 = around 0.035</output>

<gadget id="calculator">60 * 30 * (7/200)</gadget>
<output>63</output>

<result>63</result>