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katrin2010
[14]
3 years ago
11
A scientist has saline solutions with concentrations of 4% and 14% . He wants to mix some of each solution to get 65 milliliters
of solution with a 6% concentration. How many milliliter of each solution does he need to mix together?
Mathematics
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Komok
[63]
3 years ago
8
0
Let volume of 4% solution = x and of 14% be y
them x + y = 65........(1) also using the actual weights of salt:-
0.04x + 0.14y = 65*0.06 = 3.9
multiplying the above equation by -25 we have
-x - 3.5y = -97.5 adding this to equation (1)
--2.5y = -32.5
y= 13
and x = 65 - 13 = 52
so we need 13 mls of the 14%, and 52 mls of the 4% solution.
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