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Length and breadth of a bulletin board are r cm and t cm, respectively.

(i) What will be the length (in cm) of the aluminium strip required to frame the board, if 10cm extra strip is required to fix it properly.
(ii) If x nails are used to repair one board, how many nails will be required to repair 15 such boards?
(iii) If 500sqcm extra cloth per board is required to cover the edges, what will be the total area of the cloth required to cover 8 such boards?
(iv) What will be the expenditure for making 23 boards, if the carpenter charges Rs x per board.

Answers (1)

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(i) The length (in cm) of the aluminium strip required to frame the board=(perimeter +10)cm=(2(r+t)+10)cm

(ii)15x nails will be required

(iii)area of extra cloth required to cover 8 board=8 times the area of extra cloth required to cover one board=4000sqcm

The total area of cloth required = 8(area of a rectangle)+area of extra cloth required to cover 8 board=(8rt+4000)sqcm

(iv)Charge per board=x

For 23 boards charge=23x

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Safeer PP

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