Answers

2016-01-27T17:22:43+08:00
Let x = width
x + 3 = length

2(x + x + 3) = 76 
2x + 2x + 6 = 76 
4x + 6 = 76 
4x = 76 - 6
 \frac{4x}{4} =  \frac{70}{6}
x = 17.5 cm - length
x + 3 = 17.5 + 3 = 20.5 cm - width

Check:
P=2(l+w)\\P=2(17.5cm+20.5cm)\\P=2(38cm)\\P=76cm
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