Surface area and volume of a cube and cuboid.

GANGSTARNewbie

# The cost of preparing the walls of a room 12 long metre long at the rate of Rs 1.35 per square metre is Rs 340.20 and the cost of matting the floor at 85 paise per square metre is RS 91.80.find the height of the room?

Share

## Ritik kumar

Area of the floor =Rate per m2Cost of matting=(0.8591.80)m2=108m2

∴ Breadth of the room =lengthArea of floor=(12108)m=9 m

Area of four walls of the room =Rate per m2Cost of preparing the walls=1.35340.20 m2=252 m2

Also, of four walls =2(Length+Breadth)×Height=2(12+9)×height

∴(12+9)×height=252⇒h=6 m

## Mehul

## Prince kumar

Area of the floor =Rate per m2Cost of matting=(0.8591.80)m2=108m2

∴ Breadth of the room =lengthArea of floor=(12108)m=9 m

Area of four walls of the room =Rate per m2Cost of preparing the walls=1.35340.20 m2=252 m2

Also, of four walls =2(Length+Breadth)×Height=2(12+9)×height

∴(12+9)×height=252⇒h=6 m

## Prashantkumar

Area of the floor =Rate per m2Cost of matting=(0.8591.80)m2=108m2

∴ Breadth of the room =lengthArea of floor=(12108)m=9 m

Area of four walls of the room =Rate per m2Cost of preparing the walls=1.35340.20 m2=252 m2

Also, of four walls =2(Length+Breadth)×Height=2(12+9)×height

∴(12+9)×height=252⇒h=6 m

## Shivansh Preet

## DON

This answer was edited.SOLVED IN ATTACHMENT