The cost of tilting the floor of a rectangular room is Rs. 9100 at Rs. 65 per m2. The ratio of the length and breadth of the floor is 7 : 5. The perimeter (in m) of the floor of the room is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 48
Total cost = 9100
Rate of tilting the floor = 65/m2.
Area of the floor = 9100/65 = 140m2.
Let the length and breadth if the floor be 7x and 5x
⇒ 7x × 5x = 140
⇒ 35x2 = 140
⇒ x = 2.
Perimeter of the floor = 2(l + b) = 24x = 24 × 2 = 48m.