Question

Solve the following: 14 marks each
1. The length, breadth and height of a room are 8 m, 5 m and 4 m respectively. There
are two doors measuring 2.5 m x 1m each and two windows measuring 2 mx1m
each. Find the cost of painting all the four walls and the ceiling at the rate of
* 40/m2​

Answer 1

Answer:

first find area of four wall and ceiling =

2 ( lb + bh + hl)

= 2 ( 40 m²× 20m² × 32m²)

= 2 × 25600m²

= 51200m²

area of two door = (2.5 m × 1 m)× 2

= 2.5m² × 2

= 5.0m²

area of two windows = ( 2m × 1m)

= 2m²

area of room exclude windows and doors =

51200m² - 5m² - 2m²

= 51195m² - 2m²

= 51193m²

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