Anand Singh
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The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50 per m².

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NCERT Solutions for Class 9 Maths Chapter 13
Important NCERT Questions
Surface Areas and Volumes
NCERT Books for Session 2022-2023
CBSE Board, UP Board and Other state Boards
EXERCISE 13.1
Page No:213
Questions No:2

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2 Answers

  1. Get Hindi Medium and English Medium NCERT Solution for Class 9 Maths to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-9/maths/chapter-13/

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  2. Lenght of room l = 5 m, breadth b = 4 m and height h = 3 m
    Area of four walls and ceilling = Total surface area of room – area of floor
    = 2(lb + bh + hl) – lb
    = 2(5 × 4 + 4 × 3 + 3 × 5) – 5 × 4 m²
    = 2(20 + 12 + 15) – 20 m²
    = 2(47) – 20 m²
    = 94 – 20 = 74 m²
    Therefore, the area of four walls and ceilling = 74 m²
    Hence, the cost of white washing the walls of walls of the room and the ceilling
    = Rs 7.50 × 74 = Rs. 555.00

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