There are two barrels of oil in warehouse A and B. Originally, oil in barrel A was 7.8 tons more than barrel B. Later, barrel A took away 4.5 tons of oil, and barrel B brought in 3.6 tons. Now who has more oil in barrel A and barrel B? How many tons?
仓库有甲乙两桶油，原来甲桶油比乙桶油多7.8吨，后来甲桶油运走4.5吨，乙桶油运进3.6吨，现在甲乙两桶油谁存的油多？多多少吨？
<gadget id="calculator">7.8 - 4.5</gadget>
<output>3.3</output>

<gadget id="calculator">3.6 - 3.3</gadget>
<output>0.3</output>

<result>0.3</result>