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Last Updated On 23-10-2022 - By Sara

The ratio of the height of a room to its semi-perimeter is 2:5. It costs Rs. 260 to paper the walls of the room with paper 50 cm wide at Rs. 2 per m allowing an area of 15 sq. m for doors and windows. The height of the room is

(a)

2.6 m

(b)

3.9 m

(c)

4 m

(d)

4.2 m


Question ID - 50057 :-

The ratio of the height of a room to its semi-perimeter is 2:5. It costs Rs. 260 to paper the walls of the room with paper 50 cm wide at Rs. 2 per m allowing an area of 15 sq. m for doors and windows. The height of the room is

(a)

2.6 m

(b)

3.9 m

(c)

4 m

(d)

4.2 m

1 Answer
5876 Votes
3537

Answer Key : (c) -

Let  and

 

Length of the paper =  m.

 

Area of the paper  =

 

Total area of 4 walls =

 

 

Height of the room = 4 m.



Next Question :

The length, breadth and height of the room are in the ratio 3:2:1. The breadth and height of the room are halved and length of the room is doubled. The area of the four walls of the room will

(a) Decrease by 13.64%                             (b) Decrease by 15%

(c) Decrease by 18.75%                             (d) Decrease by 30%


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