Question

the length of a rectangular black body double its width if the if the width is 1.4 m find its area . also find the cost of painting the blackboard at the rate of rupees 19 per metre square​

Answer 1

Answer:

Step-by-step explanation:

length = 56.1

Step-by-step explanation:

length=3x

breadth=x

width = 1.5m = 150cm

perimeter=2 (l+b)

150 = 2× 4x

150 = 8x

x = 150/8

x= 18.7

breadth is 18.7

length is 56.1

Answer 2

Answer:

Width =1.4

Length of = 2(width) = 2(1.4) =2.8

Area of rectanglerectangle =1.4(2.8)

1.4(2.8)=3.92

Total cost for painting = 19(3.92)

19(3.92)=70.92

So the total cost of the painting is rupees 70.48