Two adjacent sides of a rectangle are $60 + 9 b$ & $8 a - u b$ . Find its perimeter.

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Solution

Sides are ,
$60 + 9 b$ and $8 a - u b$
Perimeter $= 2 (l e n g t h + b r e a t h)$
$= 2 (60 + 9 b + 8 a - u b)$
Perimeter $= 16 a + (18 + 2 u) b + 120$

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