A water tank is 15 meter long, 10 meter wide and 3 meter deep. The tot

1.	A water tank is 15 meter long, 10 meter wide and 3 meter deep. The total cost to repair its four walls and bottom at the rate of 24 rupees per square meter is:1. Rs. 96002. Rs. 48003. Rs. 36004. Rs. 7200
Answer» Correct Answer - Option 4 : Rs. 7200 Given: Length of the water tank = 15 m The breadth of the water tank = 10 m Depth of the water tank = 3 m The cost of repair = Rs 24 per m² Formula used: The total surface area of the cuboid = 2(lb + bh + lh) Calculation: The upper part of the tank is not included, so The area of the five walls = 2(lb + bh + lh) – lb ⇒ 2(bh + lh) + lb ⇒ 2(10 × 3 + 15 × 3) + 15 × 10 ⇒ 2(30 + 45) + 150 ⇒ 150 + 150 = 300 m² Total cost of repair walls = 300 × 24 = 7200 ∴ The total cost of repair walls of the water tank is Rs 7200

A water tank is 15 meter long, 10 meter wide and 3 meter deep. The total cost to repair its four walls and bottom at the rate of 24 rupees per square meter is:1. Rs. 96002. Rs. 48003. Rs. 36004. Rs. 7200

Answer» Correct Answer - Option 4 : Rs. 7200

Given:

Length of the water tank = 15 m

The breadth of the water tank = 10 m

Depth of the water tank = 3 m

The cost of repair = Rs 24 per m²

Formula used:

The total surface area of the cuboid = 2(lb + bh + lh)

Calculation:

The upper part of the tank is not included, so

The area of the five walls = 2(lb + bh + lh) – lb

⇒ 2(bh + lh) + lb

⇒ 2(10 × 3 + 15 × 3) + 15 × 10

⇒ 2(30 + 45) + 150

⇒ 150 + 150 = 300 m²

Total cost of repair walls = 300 × 24 = 7200

∴ The total cost of repair walls of the water tank is Rs 7200

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