The concentration of salt water in bottle A is 8%, the concentration of salt water in bottle B is 5%, and the concentration after mixing is 6.2%. If (1/4) salt water is taken from bottle A and (1/6) salt water is taken from bottle B, then the mixed What is the concentration.
甲瓶盐水浓度为8%，乙瓶盐水浓度为5%，混合后浓度为6.2%，若从甲瓶取(1/4)盐水，从乙瓶取(1/6)盐水，则混合后的浓度为多少．
<gadget id="calculator">6.5 / 100</gadget>
<output>0.065</output>

<result>0.065</result>