Question

cost of preparing the four walls of a room at 75 paise per square metre is rupees 240 . the height of the room is 5 metre . find the length and breadth of the room if they are in the ratio 5 is to 3

Answer 1

here is the answer
2h(l+b)=240/0.75
2×5×(5x+3x)=320
10×8x=320
x=4
so l=5x=5×4=20m
b=3x=3×4=12m