Subject: General Aptitude · Chapter: Area · Exam: · Marks: · Difficulty:
The dimensions of a room are 12.5 metres by 9 metres by 7 metres. There are 2 doors and 4 windows in the room; each door measures 2.5 metres by 1.2 metres and each window 1.5 metres by 1 metre. Find the cost of painting the walls at ₹ 3.50 per square metre.
(a)₹ 1050.50
(b)₹ 1011.50
(c)₹ 1101.50
(d)Cannot be determined
Answer
Answer (as printed): B
Explanation
Area of 4 walls $=2(l+b) \times h$ $$=[2(12.5+9) \times 7] \mathrm{m}^{2}=301 \mathrm{m}^{2} .$$ Area of 2 doors and 4 windows $$=[2(2.5 \times 1.2)+4(1.5 \times 1)] \mathrm{m}^{2}=12 \mathrm{m}^{2} .$$ ∴ Area to be painted $=(301-12) \mathrm{m}^{2}=289 \mathrm{m}^{2}$. Cost of painting $=₹(289 \times 3.50)=₹ 1011.50$.