Question

The cost of constructing a wall 8 m long, 4 m high and 20 cm thick at the rate of Rs. 25 per m³ is
A. Rs. 16
B. Rs. 80
C. Rs. 160
D. Rs. 320

Answer 1

Given: The cost of constructing a wall 8 m long, 4 m high and 20 cm thick at the rate of Rs. 25 per m³.

Length of a wall , (l) = 8 m

Breadth of a wall, (b) = 4 m

Depth of a wall ,(h) = 20 cm = 20/100 = 0.2 m  

[1 cm = 1/100 m]

Volume of a wall, V = l × b × h

V = 8 × 4 × 0.2

V = 32 × 0.2

V = 6.4 m³

Volume of a wall = 6.4 m³

 

Cost of constructing 1 m³  of  a wall = ₹ 25

Cost of digging 6.4 m³ of a wall = 25 × 6.4 = ₹ 160

Hence, cost of constructing a wall  is ₹ 160.

Option (C) ₹ 160 is correct.

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Answer 2

Volume = lbh

= 8 × 4 × 20/100

= 6.4 cu cm

Rate = 25 per sq m

6.4 × 25 = 160

Thus, (C) Rs. 160 is right