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Let the lenght be 4x and the width be x:

Perimeter = 2(4x+x) = 90 cm

8x+2x = 90

10x = 90

x = 9

Therefore: length = 36 cm and width = 9 cm

Check: 36+36+9+9 = 90 cm

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Q: Find the length and width for the length of a rectangle is four times the width and the perimeter is ninety cm?
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