Answer
x = 14 lefties
Work Step by Step
Set up a proportion.
3 lefties/30 people = x lefties/140 people
Cross multiply.
30x = 420
Solve.
x = 14 lefties
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 2 - Solving Equations - 2-7 Solving Proportions - Practice and Problem-Solving Exercises - Page 128: 37
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