Algebra 1

by Hall, Prentice

Published by Prentice Hall

ISBN 10: 0133500403

ISBN 13: 978-0-13350-040-0

Chapter 2 - Solving Equations - 2-7 Solving Proportions - Practice and Problem-Solving Exercises - Page 128: 37

Answer

x = 14 lbs

Work Step by Step

Step 1) (3/30) = (x/140) Step 2) 420 = 30x Step 3) 420 ÷ 30 = x Step 4) x = 14 --- You need to set up a proportion to find the number of lefties in a group of 140 people at a rate of 3 lefties per 30 people. Let x equal the number of lefties. Cross multiply to solve for x.

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