



 
Josh, Suppose the length of the driveway is L feet and the width is W feet. The perimeter is 168 feet so walking around the driveway and measuring the sides gives
or just going half way around
This can be rewritten
Now look at the sentence "The length is 12 feet longer than three times the width." If the width is W feet what is 3 times the width? What is 12 feet more than three times the width? This is the length so now you have a second expression for L. Set the two expressions equal to each other and solve for W. I hope this helps,  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 