To find out how many more gallons of white paint Denise used, we need to subtract the amount of white paint from the amount of blue paint.
Denise used 11 45 gallons of blue paint and 17 34 gallons of white paint.
To subtract mixed numbers, we need to make sure the fractions have the same denominator. In this case, both fractions have a denominator of 45.
11 45 - 17 34 = (11 * 45 + 45) - (17 * 45 + 34) = 495 + 45 - 765 - 34 = 540 - 799 = -259
Therefore, Denise used 259 gallons more of blue paint compared to white paint.
Please note that the result is negative, which means Denise used more blue paint than white paint.