Question

The area of a rectangular painting is 15m its length is 5 m, how much will it cost to put a wooden border around it at ₹ 15 per metre.
(a) 225
(b) 240
(c) 120
(d) 250

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Answer 1

Answer:

A= l x b

15m2= 5 x b

15/5=b

3=b

breadth = 3m

Perimeter= 2(l+b)

            =2( 5+3)

          =2 x 8 = 16m

cost= 16 x 15 = Rs.240

The correct answer is option b.

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Answer 2

Answer:

first we will find the perimeter of the painting

formula- area/length=15m/5m = 3m

perimeter- 2x length + breadth

= 2x (5m + 3m)

=16m

cost of border per m = rs 15

= 16mx rs 15m

= rupees 240

sothe cost of putting the wooden border is rupees 240

Hope it helps