There are two barrels of oil in a store, and the mass of each barrel is 5 kg. Now two barrels of oil are to be distributed to two customers, and the mass ratio of A and B is 3:2, so how many kilograms of oil should be poured from B into A?
某商店有两桶油，每桶油的质量都是5千克．现在要把两桶油分给两位顾客，并且甲、乙两桶油的质量比为3：2，那么应从乙桶中倒入多少千克油到甲桶？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">5 * (2/5) * 3</gadget>
<output>6</output>

<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<result>1</result>