A and B have two barrels of oil. The weight of oil in barrel A is (4/5) that of oil in barrel B. Oil in barrel B is 5 kg more than barrel A. How much does barrel B weigh?
甲乙两桶油，甲桶油的重量是乙桶油的(4/5)，乙桶油比甲桶油多5千克，乙桶油重多少千克？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5 / (1/5)</gadget>
<output>25</output>

<result>25</result>