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. I still do not understand this quest

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Question 808453: 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.
I still do not understand this question about explanation. I really want to explain clearly step by step for me.
The right answer 50ml 50%

Please helps for me
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Let x, y, z be the volumes of the 50, 20, 5 percents drug H solutions.

%2850x%2B20y%2B5z%29%2F600=10 and x%2By%2Bz=600 is your system of equations. This system is two equations and three unknowns. The possible answer of x=50 is NOT the only possible answer.