Answer
$200$ mL
Work Step by Step
Let $x$ be the amount of $60\%$ solution, then the amount of $30\%$ solution is $300-x$. Then our equation is: $x\cdot0.6+(300-x)0.3=300\cdot0.5\\0.6x+90-0.3x=150\\0.3x=60\\x=200$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter P, Prerequisites - Section P.9 - Modeling with Equations - P.9 Exercises - Page 72: 47
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