A rectangular water tank is 10 metre long, 8 metre wide and 2 metre de

1.	A rectangular water tank is 10 metre long, 8 metre wide and 2 metre deep. Find the total cost to repair its four walls and bottom at the rate of Rs 15 per square metre.
Answer» Floor area of water tank = length x breadth = 10 x 8 = 80 m² Area of four walls of the water tank = 2(l + b) x h = 2 x (10 + 8) x 2 = 2 x 18 x 2 = 72 sq. m Total area = (72 + 80) m² = 152 m² ∵ Cost of repairing 1 m² is Rs 15. ∴Cost of repairing 152 m²= Rs 15 x 152 = Rs 2,280

A rectangular water tank is 10 metre long, 8 metre wide and 2 metre deep. Find the total cost to repair its four walls and bottom at the rate of Rs 15 per square metre.

Answer»

Floor area of water tank

= length x breadth = 10 x 8 = 80 m²

Area of four walls of the water tank

= 2(l + b) x h

= 2 x (10 + 8) x 2

= 2 x 18 x 2

= 72 sq. m

Total area = (72 + 80) m²

= 152 m²

∵ Cost of repairing 1 m² is Rs 15.

∴Cost of repairing 152 m²= Rs 15 x 152

= Rs 2,280