Question

length of a class room is two times it height and it breadth is 3/2 times it height .the cost of white washing the walls at the rate of Rs 1.60 per m is RS 179.20 find the cost of tilling the floor at the rate of RS 6.75 per m

Answer 1

Let the height be x

Then, length =2x and breadth =3x/2

Area of four walls =179.20/1.60==112m²

2(2x+3x/2)*x=112

x*(4x+3x)/2==61

4x²+3x²=112

7x²=112

x²=112/7

x²=16

x=4

Then, hiegth or rectangle is 4*2=8m

Then, length=8m and breadth =3*4/3=4

Perimeter of rectangle =2(l+b)

Here, perimeter of rectangle =2(8+4)=*2=24m

Cost of tilling =24*6.75

Cost of the at the rate of 6.75 is rupees 162



I hope this will help you

Answer 2

hope it helps and sorry for handwriting