Two barrels, A and B, each have 400 grams of oil. Now put 100 grams of oil in barrel A into barrel B. At this time, the amount of oil in barrel A is the amount of oil in barrel B.
甲乙两桶各有400克油，现把甲桶中的100克油到入乙桶，这时甲桶油是乙桶油的多少．
<gadget id="calculator">400 - 100</gadget>
<output>300</output>

<gadget id="calculator">400 + 100</gadget>
<output>500</output>

<gadget id="calculator">300 / 500</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>