A wall is the form of a trapezium with height 4 m and parallel sides being 3 m and 5 m What is the c...........

Quantitative Aptitude ( CCS) Mensuration 2D

A wall is the form of a trapezium with height 4 m and parallel sides being 3 m and 5 m. What is the cost of painting the wall, if the rate of painting is Rs. 25 per sq m ?

Rs. 240

Rs. 400

Rs. 480

Rs. 800

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Explanation:

Given, a = 3 m, b = 5 m and h = 4 m
We know that,
Area of trapezium = 1/2 (a + b) × h
= 1/2(3 + 5) × 4 = 16 m²
∴ Total cost of painting Rs. 25 per sq m = 16 × 25 = Rs. 400