Cost of bricks for a wall from volume: Bricks cost Rs 750 per 1000. Each brick measures 25 cm × 12.5 cm × 7.5 cm. Find the cost of bricks to build a wall 200 m long, 1.8 m high, and 37.5 cm thick (ignore mortar gaps).

Introduction / Context:The number of bricks required equals (volume of wall) / (volume of one brick). Multiplying the brick count by the rate per 1000 gives the total cost. Unit consistency (meters vs centimeters) is essential.

Given Data / Assumptions:

• Wall: 200 m × 1.8 m × 0.375 m
• Brick: 25 cm × 12.5 cm × 7.5 cm = 0.25 m × 0.125 m × 0.075 m
• Rate: Rs 750 per 1000 bricks
• Ignore mortar allowances (ideal packing).

Concept / Approach:

• Compute both volumes in the same units.
• Number of bricks = V_wall / V_brick; Cost = (bricks / 1000) * rate.

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

• Rs. 42, 600 / 41, 860 / 40, 750: Result from rounding, wrong brick volume, or rate errors.

Common Pitfalls:

• Mistaking cm for m in one dimension.
• Forgetting to divide by 1000 before multiplying by rate.

Final Answer:

Rs. 43, 200