Final answer:
Joe ate 7/10 of the pizza after consuming 4/5 of the 7/8 pizza that was left over.
Step-by-step explanation:
The question asks about finding the amount of pizza Joe eats when he consumes 4/5 of the 7/8 pizza that was leftover. To find the amount Joe ate, we multiply these fractions. The calculation now is (4/5) * (7/8). First, we multiply the numerators: 4 * 7 equals 28. Then, we multiply the denominators: 5 * 8 equals 40. Therefore, the fraction representing the amount of pizza Joe ate is 28/40, which can be simplified by dividing both numerator and denominator by 4, resulting in 7/10. So, Joe ate 7/10 of the pizza.