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Question: Length of rectangular tank is twice its breadth. If the depth of the tank is 3m and area of its four walls is 108m(square), find the length of the tank.
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area of four walls is= 4×(l+b)
108=4×x+2x
108=4×3x
108=12x
108÷12=x
x=9
length=18
breadth=9
108=4×x+2x
108=4×3x
108=12x
108÷12=x
x=9
length=18
breadth=9
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