A large rectangular garden is to be enclosed by a fence and divided into 5 regions by 4 parallel fences across the interior of the garden as shown below. 
Find the values of l and w for which the total area of the garden is as large as possible, assuming that 120 ft of fencing is available.
Definitions:
Profit Margin
A measure of profitability calculated as net income divided by revenue.
Equity Financing
The method of raising capital through the sale of shares in a company, giving investors ownership interests.
Current Liabilities
Obligations or debts a company expects to settle within one fiscal year or its operating cycle, whichever is longer.
Profit Margin
A financial ratio evaluating a company's profitability, calculated by dividing net income by sales revenue.
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