Cost of carpeting a room — Mensuration Aptitude Question
Cost of carpeting a room: What does it cost to carpet a room 15 m × 12 m with carpet costing ₹40 per square metre? Answer and worked solution on CodeKairo.
- Topic: Mensuration
- Section: Quantitative Aptitude
- Difficulty: Easy
- Time target: 45 seconds
Question
What does it cost to carpet a room 15 m × 12 m with carpet costing ₹40 per square metre?
Options
- ₹6,400
- ₹7,200
- ₹8,000
- ₹9,600
Show the answer and the worked solution
Correct answer: B. ₹7,200
Worked solution
- Area = 15 × 12 = 180 m².
- Cost = 180 × 40 = ₹7,200.
Answer: ₹7,200.
The idea
Area then rate. If the carpet were sold by length at a given width, you would divide the area by that width first.
Shortcut. Multiply the easy pair first: 15 × 40 = 600, then 600 × 12 = ₹7,200.
Common trap. ₹8,000 looks right as a round figure (200 m² × ₹40), but the room is 15 × 12 = 180 m², not 200.