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This is one problem I made:

The rectangular lot has a width of 5 cm. If the perimeter is 40 cm, what is the length?

The formula for the perimeter of a rectangle is P=2(L+W)
since P is 40, just substitute:

Divide both sides by 2
Subtract both sides by 5

The length is 15 cm. If you tried to check it:
P=40 cm

Hope this helps =)
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