Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 7 - Section 7.2 - Proportion - Exercises - Page 277: 43


$44\ ft^3$ sand

Work Step by Step

Create a proportion using ratios of sand:concrete. $\frac{2.75\ ft^3\ sand}{8\ ft^3\ concrete}=\frac{x\ ft^3\ sand}{128\ ft^3\ concrete}$ Set the product of the means equal to the product of the extremes and solve for the variable. $8 \times x=2.75\times 128$ $8x=352$ $8x\div8=352\div8$ $x=44$
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