The ratio of the side of the room is 5 2 the cost of whitewashing the ceiling of the room at 50 pais...........

Quantitative Aptitude ( CCS) Mensuration 3D

The ratio of the side of the room is 5:2, the cost of whitewashing the ceiling of the room at 50 paise per square metre is Rs.2500 and the cost of preparing the walls at 30 paise per square metre is Rs.2100. The height of the room is ?

31m

36m

23m

20m

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Explanation:

Answer – 23m
Explanation :
Area = 2500/0.50 = 5000sq metres
5x*2x = 5000
10x² = 5000
X² =500
X=22.36 = 22
Area of wall = 2100/0.30 = 7000sq units
H = 7000/2(110+44) = 7000/308 = 22.72 = 23m