In an exhibition

Given:

Total display boards = 24

Length of strip = 100 m

Length of one display board = 1 + 0.5

= 1.5 m

Breadth of one display board = 1 m

Perimeter of one display board = 2 × (l + b)

= 2 × (1.5 + 1)

= 5 m

Number of boards which will be framed = 100 / 5

= 20

Number of boards unframed = 24 – 20

= 4

Length of strip for required for remaining boards = 4 × Perimeter of one board

= 4 × 5

= 20 m.