Question

The height of a rectangular room is 2.5m.the cost of painting four walls at Rs 20 per m square is Rs 2500.find the perimeter of the room

Answer 1

hey
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P= 2×(l+b)

area = cost / rate
area = 2500/20 = 125

area of 4 walls = 2(l+b)×h
125 = 2(l+b)×25/10
125×10/25 = 2(l+b)
50 = 2(l+b)

hence ans is 50 m

hope helped
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Answer 2

$\bf\huge\boxed{\boxed{\boxed{\:Content\:Quality}}}$

Perimeter = 2 ×(length + breadth)

Area = $\bf\huge\frac{Cost}{Rate}$

Area = $\bf\huge\frac{2500}{20}$

= 125

Area of 4 walls = 2(length + breadth) × height

125 = 2(length + breadth) × $\bf\huge\frac{25}{10}$

125 × $\bf\huge\frac{10}{25}$ = 2(length + breadth)

50 = 2(length + breadth)

Perimeter = 50m

$\bf\huge\boxed{\boxed{\boxed{\:Answer\:=\:50\:m}}}$