<PRE><B>Question 1127661</B>
H=X  W=X+3  L=X+7

LWH =  X^3+10X^2+21X=480 so


 X^3+10X^2+21X-480=0 


Using a bit of guess and check, we easily find  X=5 


(Note, X has to be positive, and at 1, we get 32-480, very negative. Jumping to 3, we have 27+90+63-480= -300, so we jump to 5 and see 125+250+105-480=0)



5 * 8 * 12 =480</PRE>