1/8 more vegetarian pizza was eaten than pepperoni pizza.
To find this answer, you must first find a common denominator for the 2 fractions given. To do this, multiply 3/4 by 2/2 to get 6/8. Lastly, take 6/8 (the fraction of the vegetarian pizza eaten) and subtract 5/8 (the fraction of the pepperoni pizza eaten) to get 1/8 more vegetarian pizza eaten. Thus meaning that's the answer.
I hope this helps!