There are two buckets, bucket A is full of water and bucket B is empty. If half of the water in bucket A is poured into bucket B, it just fills (2/3) of bucket B, and after pouring out (1/6) of the water in bucket B, there will be 15 kg left. How many kilograms of water can a bucket hold?
有两只水桶，甲桶装满水，乙桶是空桶．如果把甲桶里半桶水倒入乙桶，刚好装了乙桶的(2/3)，再把乙桶的水倒出(1/6)后，还剩15千克．甲桶可以装水多少千克？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(2/3) - (1/6)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">15 / (1/2)</gadget>
<output>30</output>

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

<gadget id="calculator">(2/3) / (1/2)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">30 * (4/3)</gadget>
<output>40</output>

<result>40</result>