<PRE><B>Question 810780</B>
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 
The right answer 50ml 50% Several teachers already solved this question which is not right. 
I great appreciate Rich for me to solve it again step by step 
This equation is not right
0.5a + 02%b + 0.05c = 0.1 x 600
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You have 3 variables.  You need a statement that relates
two of those variables.
You have f + t + v = 600
You have 0.5f + 0.2t + 0.5f = 0.1*600
Need one more equation.
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Cheers,
Stan H.
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