Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 9 Answered

The cost of preparing the walls of a room 12 m long @ Rs 1.35 m2 is Rs 340.20 and the cost of matting the floor at 85 p  per m2 is Rs 91.80 , find the height of the room ?
Asked by nisha_vini29 | 16 Feb, 2016, 12:00: PM
answered-by-expert Expert Answer
begin mathsize 14px style Let space straight l space be space the space length comma space straight b space the space breadth space and space straight h space be space the space height space of space the space room Length space of space room space equals space 12 space straight m space Cost space of space matting space the space floor space a t space 85 space p divided by m squared comma space i. e. comma space a t space R s. space 0.85 space divided by m squared equals space Rs.91.80 space Area space of space floor space equals cost space of space matting space the space floor divided by cost space per space metre space therefore Area space of space floor space equals 91.80 divided by 0.85 space equals space 108 therefore Area space of space floor space equals space 108 straight m squared therefore Area space of space floor space equals space straight l cross times straight b space therefore 108 space equals space 12 cross times straight b space therefore straight b space equals space 9 space straight m Cost space of space preparing space the space wall space a t space R s.1.35 divided by straight m squared equals space Rs. space 340.20 space Area space of space walls equals cost space of space preparing space the space walls divided by cost space per space metre Area space of space walls equals 340.20 divided by 1.35 space equals 252 space straight m squared Area space of space walls space equals space 2 open parentheses straight l cross times straight h close parentheses plus 2 open parentheses straight b cross times straight h close parentheses therefore 252 space equals space 2 open parentheses 12 cross times straight h close parentheses plus 2 open parentheses 9 cross times straight h close parentheses equals 2 straight h left parenthesis 12 plus 9 right parenthesis therefore 252 equals 42 straight h therefore straight h space equals 6 therefore Height space of space the space room space equals 6 space straight m. end style
Answered by Priti Shah | 16 Feb, 2016, 12:58: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 9 - Maths
If side of a cube is increase by 20% so how much percentage will its diagonal increase
Asked by sg871787 | 11 Jan, 2021, 08:01: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
Asked by swatipuspapatel | 17 Oct, 2020, 07:29: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
area of eqilatteral triangle
Asked by sy5620331 | 07 Jun, 2020, 01:51: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
What will be the surface area ,lateral surface area and diagonal of cuboid.whose length=square root of three , breath=square root of seven and the height=square root of eleven??
Asked by dhyeyvachani26.tl | 12 Apr, 2020, 04:10: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
if length of cube is 16root3 find diagonal
Asked by arajeevshashank | 03 Dec, 2019, 06:33: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
A cube
question image
Asked by nirmalaraj7339 | 05 Jan, 2019, 10:52: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
length=12m,breadth=8m, and height=4.5m find the total surface area  
Asked by raviraj23032003 | 15 Jul, 2018, 09:28: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
  Find the cost of painting an open rectangular tank of dimensions 4 m × 2.5 m × 5 m at the rate of Rs 5.50 per m2.
Asked by Topperlearning User | 23 Aug, 2017, 12:56: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
Find the cost of sheet required for making a cuboidal box measuring 3 m × 5 m × 3.5 m, if 1 m2 costs Rs 21.
Asked by Topperlearning User | 23 Aug, 2017, 12:57: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
A concrete pillar 15 m high has a cross section which is square of side 3 m. Find the cost of painting its top and four walls at the rate of Rs 4 per m2.
Asked by Topperlearning User | 23 Aug, 2017, 12:58: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×