Answer
483
Work Step by Step
three digit number is $zyx$
$x+y+z=15$
$y=2*z$
$x+1=z$
$x+1=z$
$x=z-1$
$x+y+z=15$
$(z-1)+2z+z=15$
$z-1+3z=15$
$4z-1=15$
$4z=16$
$4z/4=16/4$
$z=4$
$x+1=z$
$4=x+1$
$3=x$
$y=2*z$
$y=2*4$
$y=8$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 9 - Section 9.1 - Solving Systems of Linear Equations in Three Variables and Problem Solving - Exercise Set - Page 639: 38
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