The perimeter of a driveway is 168 ft. The length is 12 ft. longer than three times the width. What are the dimensions of the driveway?
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These are statements made to you. Use the information from the first statement to solve for the other variable in the second statement. Doing this you get:
The width is 18. Good. What is the length? Use one of your true statements to solve for the other variable.
To conclude, The Width is 18 and the Length is 66.