Surface Area And Volume Test

Result

Surface Area And Volume Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

The total cost of white-washing the four walls of a room is Rs. 6520. The length, width and height of the room are 20 m, 16 m and 25 m, respectively. Find the approximate values of the following:

(a) Per m² cost of white-washing the four walls
(b) Total cost of white-washing, if the area of doors and windows which occupy the area of 34 m² is ignored

A
(a) Rs. 3.62
(b) Rs. 6392.92

B
(a) Rs. 5.62
(b) Rs. 6834

C
(a) Rs. 8.10
(b) Rs. 7804.60

D
(a) Rs. 10.62
(b) Rs. 8930.05

Solution

(a) Area of four walls = 2(l + b)h

= 2(20 + 16) × 25
= 1800 m²
Now, per m² cost of white-washing the four walls = Total cost/Total area = Rs.6520/1800 = Rs. 3.62

(b) Area of doors and windows = 34 m²

Area of four walls = (1800 - 34) m²= 1766 m²(Ignoring the area of windows and doors)
Therefore, cost required for white-washing = 1766 x 3.62 = Rs. 6392.92