A barrel of oil weighs 50 kilograms, which is 1/4 of the mass of oil in barrel B. What is the weight of barrel B in kilograms?
甲桶油重50千克，是乙桶油质量的(1/4)，乙桶油重多少千克．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">50 / (1/4)</gadget>
<output>200</output>

<result>200</result>