A=L x W Substitute with the numbers you know (you know area and length). You will then have an equation solve by dividing 510 7/8 by 30 1/2. Don't forget to first change these mixed numbers to improper fractions. After they are changed to improper fractions, multiply 4087/8 x 2/61 (remember you "flipped" the second fraction). Then change answer back to mixed number. You should get approximately 16 3/4 or 16.75