Question 1046723
L = 3W
and
2L+2W = 120 Substitute for L:
2(3W)+2W = 120
6W+2W = 120
8W = 120
W = 15 this is the width. And length:
3(15) = 45 is the length
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Check:
2(45)+2(15) 
= 90+30 = 120 Correct.
:
John