Discussion
Ramesh’s bedroom has a rectangular floor. He built the 4 walls of this room in Rs. 24000 at the rate of Rs. 20 per sq. m. What is height of his bedroom if perimeter of the floor is 150m?
Answer: B
Find the wall area from the cost, then use the perimeter.
\[ \text{area of 4 walls} = \frac{24000}{20} = 1200 \text{ m}^{2} \]
The four walls form a band of height \( h \) around the floor's perimeter:
\[ \text{area} = \text{perimeter} \times h \quad\Longrightarrow\quad 1200 = 150h \]
\[ h = 8 \text{ m} \]
Writing the wall area as \( 2(l+b)h \) is the same thing, since the perimeter \( 2(l+b) \) is already given as 150 m - the individual length and breadth are never needed.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development