SOLUTION: how much 30% alcohol, 45% alcohol, 60% alcohol and 95% alcohol could be mixed to make 200ml of 50% alcohol? Who helps me to solve it for me. I great appreciate to you for you

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Question 810776: how much 30% alcohol, 45% alcohol, 60% alcohol and 95% alcohol could be mixed to make 200ml of 50% alcohol?
Who helps me to solve it for me.
I great appreciate to you for your solution step by step.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.3a+.45b+.6c+.95d=.5(200),
a+b+c+d=200
Not enough info
For every unknown, we need at least one equation.