Answer
$5 $ pounds
Work Step by Step
Currently there are $0.25\cdot20=5$ pounds of cement, thus if we add $x$ pounds, then our equation is: $\frac{5+x}{20+x}=0.4\\5+x=0.4(20+x)=8+0.4x\\0.6x=3\\x=5$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 1 - Section 1.7 - Problem Solving: Interest, Mixture, Uniform Motion, Constant Rate Job Applications - 1.7 Asses Your Understanding - Page 143: 50
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