Question

4. The length of a hall is 8 m more than its breadth. If the perimeter of the hall is 40 m, find the cost
of laying a carpet at the cost of 7 12 per sq. m.​

Answer 1

AnswEr:-

Let the Breadth be x m.

=> Length = ( x + 8) m

=> Perimeter of Rectangle = 2( l + b)

=> 40 = 2( x + 8 + x)

=> 40/2 = 2x + 8

=> 20 = 2x + 8

=> 2x = 20 - 8

=> x = 12/2

=> x = 6m.

=> Breadth = 6m and Length = 14m.

Now. Area of Rectangle = l × b

=> 14 × 6

=> 84 m^2.

Cost for 1m^2 = 12

=> Cost for 84 m^2 = 84 × 12

=> 1008.

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Answer 2

Total area of the hall=40sq.m
Cost of laying carpet for 1sq.m=₹712
So, 712 multiplied by 40=₹28,480
Answer : ₹28,480