When you need to solve this problem, you will 1st have to see how many quarters are in 3/4, so there is 3. Then you will subtract a quarter which will leave you with 2. So, there is 2/4 or 1/2 of a pizza left after Juan's father ate a quarter. (Hint: there is no need to multiply, just subtract!). (p.s. There is enough info to solve!)
-gracie60005775;)