Question

length and breadth of a hall are in the ratio 4:3 and its height is 550 cm. the cost of decorating its wall [ including doors and windows] at Rs 6.60 per square metres is Rs 5082. find the length and breadth of room.

Answer 1

let length be 4x cm and breadth be 3x cm
height=550cm
rate of decorating wall= Rs 6.60/m²
total cost of decorating wall= Rs 5082
total cost= area to be decorated × rate
5082=2(lh+bh)×6.6
5082×10=2×550×(4x+3x)×66/100
231×100=2×55×7x×3
21×100=2×5×21x
10=x
∴length =4×10=40m
breadth=3×10=30m

Answer 2

_-------------------------