Here, we have to add the number of slices that are taken by Alex from each plate.
Given that, Alex eats 34th pizza from plate 1, 78th pizza from plate 2, and 616th pizza from plate 3.
L.C.M of 4,8,16 is 16.
Now, 34 + 78 + 616
= 12+14+616
= 3216
= 2
Alex will eat two pizzas in total. Hence, he will get pass round 1.