find the perimeter of a rectangular playground with lenght 21 whole 1 upon 4 and breadth 9whole 5 upon 6
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perimeter = 2(l+b)
=2(85/4+ 59/6)
= 2 (85×3/4×3 + 59×2/6×2)
=2(255/12 + 118/12)
= 2×373/12
= 746/12
= 373/6
=62 whole 1/6
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