In order to find the remaining amount in the bag, we need to subtract 1/8 from the fraction 3/4:
[tex]\frac{3}{4}-\frac{1}{8}[/tex]To do so, first let's put both fractions in the same denominator:
[tex]\frac{3}{4}-\frac{1}{8}=\frac{6}{8}-\frac{1}{8}[/tex]Now, let's subtract the numerators and find the result:
[tex]\frac{6}{8}-\frac{1}{8}=\frac{6-1}{8}=\frac{5}{8}[/tex]Therefore the correct option is the third one (R).