Answer
$a+b=20$
$a+b\leq 20$
Work Step by Step
The sum must be equal to $20$ since there are total of $20$ people interviewed and only options were yes and no.
If we add the option "maybe" then this sum will be equal or less than $20$.
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 11 - Data Analysis and Displays - Maintaining Mathematical Proficiency - Page 583: 4
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