The mass of a barrel of oil is equal to 75% of its mass plus (3/4) kilograms. How much does the barrel of oil weigh in kilograms?
一桶油的质量等于它本身质量的75%再加上(3/4)千克，这桶油本身重多少千克．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

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

<result>3</result>