<em>w = 21 feet</em>
<em>l = 63 feet</em>
<em>l = 3w</em>
<em>P = 2(l + w)</em>
<em>168 = 2(l + w) : 2</em>
<em>84 = l + w</em>
<em>replace l</em>
<em>84 = 3w + w</em>
<em>4w = 84</em>
<em>w = 84 : 4</em>
<em>l = 3×21 feet</em>
Step-by-step explanation:
breadth = 21 m
length = 63 m
Answer:
Brien is incorrect because he skipped step 2
C. 20%
if it doesn't work im sorry