Question

(1) Length and breadth of a bulletin board are x cm and y cm, respectively. What will be
the length (in cm) of the aluminium strip required to frame the board, if 20 cm extra
strip is required to fix it properly.
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Answer 1

Step-by-step explanation:

let the length and breath be (x+20)and (x+20)

2x+40

Answer 2

The length of the aluminium strip required to frame the board is 2(x + y) + 20 cm

Solution:

Given that,

The length and breadth of board are x cm and y cm

We have to frame the perimeter of the board

Therefore, length of aluminium strip required to frame the board will be same as perimeter of board Perimeter of board

Perimeter of rectangle is given as:

Perimeter = 2(length + width)

Perimeter = 2(x + y)

But 20 cm extra strip is required to fix it properly

So add 20 to perimeter of board

Length of aluminium strip = 2(x + y) + 20

Thus length of the aluminium strip required to frame the board is 2(x + y) + 20  cm

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