4. the width of a rectangle is 6 cm less than the length. If the perimeter of the rectangle is 48 cm, what is the length of the rectangle in centimetres?
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l=x
b=x-6
perimeter=2 (l+b)
48=2 (x+x-6)
48/2=2x-6
24=2x-6
24+6=2x
30=2x
30/2=x
15=×
therefore l=x=15cm
b=x-6=15-6=11cm
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