Answer
12 inches by 18 inches
Work Step by Step
perimeter is 60 inches, length is 6 longer than width
$2x+2y=60$
$x=6+y$
$2(6+y)+2y=60$
$12+2y+2y=60$
$4y=48$
$4y/4 =48/4$
$y=12$
$x=6+y$
$x= 6+12$
$x=18$
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