Question 417614
l+w+h=17 (1)
2w=h+1   (2) 
l+w=h-1  (3)
Substitute the value for l+w from (3) into (1)
h-1+h=17 -> h=9
Using (2), we get 2w=10 or w=5
Use (1) or (3) to get l
From (3) we have l+5=8 or l=3