如果取40克甲种酒精溶液和60克乙种酒精溶液混合，那么浓度为62%；如果取同样质量的甲种酒精和乙种酒精混合，那么浓度为61%．请问：甲、乙两种酒精溶液的浓度分别是多少？
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直接写得数．= = = == = = =
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+= += ﹣= +=++= +﹣= ﹣﹣= ﹣+=
直接写出结果．+= ×10%= 3.6÷12= 80%×80%=×4÷×4= 15÷1%= ﹣+﹣=
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×10%= 3.6÷12= 80%×80%=
×4÷
×4= 15÷1%= 
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