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Question
Length of a rectangular tank is twice its breadth. If the
depth of the tank is 3 m and area of its four walls is 108 m2, find the
length of the tank.
Solution
Let breadth of the tank be x.
∴ Length of the tank = 2x.
Area of the walls of the tank = 2(length + breadth) × depth.
∴ 108 = 2(2x + x)× 3
∴ 108 = 18 x ∴ x = 6 ∴ 2x = 12
∴ Length of the tank = 12m.
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