A barrel of oil, such as the poured oil (1/4), weighs 19 kilograms with the barrel; if poured the oil (1/3), the weight with the barrel is 17 kilograms. How much does this barrel of oil weigh in kilograms?
一桶油，如倒出油的(1/4)，连桶重19千克；如倒出油的(1/3)，连桶重17千克．这桶油原来连桶重多少千克．
<gadget id="calculator">19 - 17</gadget>
<output>2</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (1/4) - (2/3)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">2 / (1/12)</gadget>
<output>24</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">24 * (3/4)</gadget>
<output>18</output>

<gadget id="calculator">19 - 18</gadget>
<output>1</output>

<gadget id="calculator">24 + 1</gadget>
<output>25</output>

<result>25</result>