Subject: General Aptitude · Chapter: Area · Exam: 2005 · Marks: · Difficulty:
A rectangular lawn 80 metres by 60 metres has two roads each 10 m wide running in the middle of it, one parallel to the length and the other parallel to the breadth. Find the cost of gravelling them at ₹ 30 per square metre.
(a)₹ 3600
(b)₹ 3900
(c)₹ 36000
(d)₹ 39000
Answer
Answer (as printed): D
Explanation
$$\begin{aligned} \text { Area of the roads } & =(80 \times 10+60 \times 10-10 \times 10) \mathrm{m}^{2} \\ & =1300 \mathrm{m}^{2} \end{aligned}$$ ∴ Cost of gravelling $=₹(1300 \times 30)=₹ 39000$.