The length breadth and height of a room are 7 m 4 m and 9 m respectively Find the cost of whitewashi...........

Quantitative Aptitude (CHSL) Mensuration 2D

The length, breadth and height of a room are 7 m, 4 m and 9 m, respectively. Find the cost of whitewashing the walls of the

room and the ceiling at the rate of Rs7.50 per m² .

This questions was previously asked in

SSC CHSL 10th June 2022 Shift-1

Rs1,965

Rs1,695

Rs1,968

Rs1,698

Let’s break it down:

- The walls to be whitewashed are four rectangles: two are 7 m × 9 m, two are 4 m × 9 m.

- Area of two walls: 2 × (7 × 9) = 2 × 63 = 126 m²

- Area of other two: 2 × (4 × 9) = 2 × 36 = 72 m²

- The area of the ceiling (which is also to be whitewashed): 7 m × 4 m = 28 m²

- Total area = 126 + 72 + 28 = 226 m²

- Cost per m² is Rs7.50.

- Total cost = 226 × 7.50 = Rs1,695

Let’s see the options:

- Option 1: Rs1,965 — higher than our calculated amount

- Option 2: Rs1,695 — matches our answer exactly

- Option 3: Rs1,968 — even higher, so out

- Option 4: Rs1,698 — close, but still not a match

Bottom line: Option 2 (Rs1,695) is the correct answer.

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