Question

The perimeter of a rectangular garden is 364 feet. If the length of the garden is 99 feet, what is its width?

Answer 1

P=2(L+W)
P=364
L=99
sub and find W
364=2(99+W)
divide both sides by 2
182=99+w
subtract 99 from both sides
83=W

w=83ft

Answer 2

Let's get to work, now.
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Yes, NOW!!
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What's the formula for the perimeter of a rectangle?
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Oh and by the way, it's for your own good. Not for my own good.
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Yes, (2 x width) + (2 x length).
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The length is 99 feet...
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MAKE AN EQUATION!!
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It's for your own good, remember!! :P
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(2 x width) + (2 x 99) = 364.
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Simplify!!
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(2 x width) + 198 = 364.
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FURTHER simplify.
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(2 x width) = 166.
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FURTHER FURTHER simplify!! 
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2 x width / 2 = 166 / 2.
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width = 83.
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There you have it.
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Hope I helped!