SOLUTION: you need to use 3 solutions of drug H containing respectively 50%, 20%, and 5% to make 600ml of 10% drug H. How much of the 50% will you use? Who try to solve it for me.

Question 601799: you need to use 3 solutions of drug H containing respectively 50%, 20%, and 5% to make 600ml of 10% drug H. How much of the 50% will you use?
Who try to solve it for me.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = ml of 50% solution needed
Let = ml of 20% solution needed
Let = ml of 5% solution needed
given:
(1) ml
(2)
This is only 2 equations and 3 unknowns,
but I can guess at a solution
--------------------------------
(2)
(2)
Multiply both sides of (1) by and
subtract (1) from (2)
(2)
(1)

I'll guess that and
then
(2)
(2)
(2)
(2)
(2)
(2)
That works, so I can use
50 ml of 50% solution needed
50 ml of 20% solution needed
500 ml of 5% solution needed
There can be other solutions, but this works

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