Question

w the cost of puting the blackboard at the rate or 4 per sq. m.
* The length of a retangular plackboard is three times its width. If the width is 1.5 m, find its area. Also,
urgent please​

Answer 1

Given:Length=3x and Breadth=x

Width=1.5m=150cm

Perimeter=2(l+b)

⇒150=2(3x+x)

⇒150=8x

⇒x=8150=18.7

∴ Breadth is 18.7m and length is 3x=3×18.7=56.1m

∴Area of the black board=18.7×56.1=1,049.07‬m2

Cost of painting per sq.m=Rs5.50

Cost of painting 1,049.07‬m2=Rs1,049.07×5.50=Rs.5,769.885