If the height of a cylindrical bucket is doubled and the diameter of the bottom is half of the original, it can hold 40 kg of water. How much water can the original bucket hold?
一个圆柱形水桶，若将高改为原来的2倍，底面直径改为原来的一半，可装水40千克，那么原来水桶可以装水多少千克．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">40 / (1/2)</gadget>
<output>80</output>

<result>80</result>