cylindrical bucket, the circumference of the inner bottom is 25.12 meters, the depth of the bucket is 40 cm, how many kilograms does this bucket of water weigh? (1 cubic decimeter of water weighs 1 kilogram)
一个圆柱形水桶，内底面周长是25.12米，水桶深40厘米，装满这一桶水重多少千克？(1立方分米的水重1千克)
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3.14 * 16 * (2/5) * 1_000 * 1</gadget>
<output>20_096</output>

<result>20_096</result>