Question: A rectangular field will have one side made of a brick wall and the other three sides made of wooden fence. Brick wall costs20dollars per

A rectangular field will have one side made of a brick wall and the other three sides made of wooden fence. Brick wall costs20dollars per meter and wooden fence costs30 dollars for3 meters. The area of the field is to be150 square meters.

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

length of the brick wall=

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