Question 1072804
A rectangle has a width of X and a length that is triple that what is the perimeter of the rectangle? 
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Let
W=width
L=length
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The perimeter, P,  of a rectangle is:  P=2L+2W

In this problem we are given L=3W=3X so just substitute "3X" for "L" in the perimeter formula:

P = 2L + 2W
Making the substitutions L=3X and W=X:
P = 2(3X) + 2(X)
P = 6X + 2X = 8X
{{{ highlight(P = 8X)}}}   and that's about as far as you can take it with the information provided.