A. The recipe required 3/4 cup of sugar and 1/8 cup of butter.
The ratio of the sugar to butter in the original recipe is
[tex]\dfrac{\frac{3}{4}}{\frac{1}{8}}=\dfrac{3}{4}\cdot \dfrac{8}{1}=\dfrac{6}{1}.[/tex]
B. If Travis accidentally put a whole cup of butter in the mix, then he needs to put
[tex]\dfrac{3}{4}\cdot \dfrac{6}{1}=\dfrac{9}{2}=4\dfrac{1}{2}[/tex] cup of sugar.
C. Travis has to put 1/8 cup of butter, but he put 1 cup of butter. The ratio is
[tex]\dfrac{1}{\frac{1}{8}}=\dfrac{1}{1}\cdot \dfrac{8}{1}=\dfrac{8}{1}.[/tex]
If Travis wants to keep the ratios the same as they are in the original recipe, he needs to put 8 times more of all the other ingredients.