Bucket A is half filled with water, but there is no water in bucket B. Now pour all the water in bucket A into bucket B, which just takes up (2/3) of the volume of bucket B. After pouring out (1/2) of the water in bucket B, there are still 20 kilograms in the bucket, how much water can bucket A hold?
甲桶里装了半桶水，乙桶里没有水，现将甲桶水全倒入乙桶，刚好占乙桶容积的(2/3)．再将乙桶的水的(1/2)倒掉后，桶里还剩20千克，甲桶可装水多少千克．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(2/3) - (1/2)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">20 / (1/6)</gadget>
<output>120</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 * (3/4)</gadget>
<output>90</output>

<result>90</result>