The perimeter of a poster is 20 feet. The poster is 6 feet tall. How wide is it?

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The perimeter of a poster is 20 feet. The poster is 6 feet tall. How wide is it?

Assumptions and givens:

• The poster has a rectangle shape
• l = 6
• P = 20
• The perimeter of a rectangle (P) is: 2l + 2w = P

Plugging in our l and P values, we get:
2(6) + 2w = 20

Multiplying through and simplifying, we get:
12 + 2w = 20

To solve for w, we type this equation into our search engine and we get:
w = 4