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Here is your answer,
Perimeter of a triangle = sum of all sides
= 7/2 + 11/4 + 16/5
=( 28 + 22/8 ) + 16/5
= 50/8 + 16/5
= 25/4 + 16/5
= 125 + 64/20
=189/20
Hope it helps you!