Question 372101
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Hi,
Let x represent the amount of the 8% solution, 
then (1L-x) would be the amount of the 6% solution
.08x + .06(lL -x) = .064*1L
solving for x
.08x + .06*1L - .06x = .064*1L
.02x = .004L
x = .2L of the the 8% solution and .8L of the 6% solution   (1L-.2L)

Note: solution problems of ALL types are solved in a similar manner