Question 188392
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Let the Height be the Width.
A rectangular book case, where P=2L + 2W
Given:
P=60ft
L=3*W
H=W
So, {{{60=2(3W)+2W}}}---> {{{60=6W+2W=8W}}} --->{{{cross(60)7.5/cross(8)=cross(8)W/cross(8)}}}
<font color=blue>W=7.5ft=Height</font>
Also, L=3*7.5=<font color=blue>22.50ft=L</font>


Check, P=2*22.5 + 2*7.5 = 45+ 15 = 60ft


Thank you,
Jojo</font>