Question: A rectangular field will have one side made of a brick wall and the other three sides made of wooden fence. Brick wall costs 20

A rectangular field will have one side made of a brick wall and the other three sides made of wooden fence. Brick wall costs 20 dollars per meter and wooden fence costs 30 dollars for 3 meters. The area of the field is to be 1350 m2.

What length should the brick wall be to give the lowest total cost of wall plus fence? (meters)

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