There are two alloys, A and B, with different amounts of copper. A weighs 6 kg and B weighs 4 kg. Now cut off a part of equal weight from each of the two alloys A and B. Smelt the cut part of block A with the rest of block B, and then smelt the cut part of block B with the rest of block A to obtain two new alloys with equal copper content. What is the weight of the part cut from each piece in kilograms?
有甲、乙两块含铜量不同的合金，甲块重6千克，乙块重4千克．现在从甲、乙两块合金上各切下重量相等的一部分．将甲块上切下的部分与乙块的剩余部分一起熔炼，再将乙块上切下的部分与甲块剩余部分一起熔炼，得到的两块新合金的含铜量相等．问从每一块上切下的部分的重量是多少千克？
<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">6 / 10</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(3/5) * 1</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">4 * (3/5)</gadget>
<output>12/5 = around 2.4</output>

<result>12/5 = around 2.4</result>