Question

The length of the room is two times its breadth and it contains 320cube meter of air.if the cost of painting its wall at Rs7.50 per sq.m is Rs 1200, find the height of the room.

Answer 1

Answer:

height=0.035m

Step-by-step explanation:

let breadth be x so length=2x

since we have given that air is 320 cube meter inside room therefore volume of room is 320m³.

now,area of room=cost per sq.m×total cost

area of room=7.50×1200

area of room=9000m²

length×breadth=9000

2x×x=9000

x²=4500

x=67.08

so length=134.16 breadth=67.08

volume=length×breadth×height

320=134.16×67.08×H

H=0.035m