There are two buckets, A and B, pour half of the water in bucket A into bucket B, which just fills bucket B (2/3), then pour out (1/6) of the water in bucket B, the remaining 15 kg of water. How much water can a bucket hold?
有甲、乙两只桶，把甲桶里的半桶水倒入乙桶，刚好装乙桶的(2/3)，再把乙桶里的水倒出(1/6)后，剩下15千克水．甲桶可装水多少水．
<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>