Question 666990
-------------- 	percent	----------------	Amount									
Solution I	60	----------------			12	ml						
Solution II	35	----------------			x	ml						
Mixture	40	----------------	12	+	x	ml						
												
60*12+35x=40(12	+x)
720+35x	=480+40x				
35x-40x	=-720	+	480				
-5	x	=	-240									
/	-5											
x	=	48		ml	Solution II							
												
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