Two barrels of oil, A and B, weigh 75kg in total. The mass (weight) ratio of oil in barrel A to barrel B is 2:3. How much does barrel B weigh in kilograms?
甲、乙两桶油共重75kg，甲桶油与乙桶油的质量(重量)比为2：3，乙桶油重多少千克？
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">75 * (3/5)</gadget>
<output>45</output>

<result>45</result>