How many pizzas did each student eat? Please help simple maths question.

Question

Three students go to a pizza dinner. Student 1 ears 1/2 of the first pizza, 1/3 of the second, 1/4 of the third and all of the fourth. Student 2 eats 1/5 of what Student 1 left. Student 3 eats 1/2 of what Student 2 left. How many pizzas did each student eat?

Answer 1

Student 1 eats 1/2 + 1/3 + 1/4 + 1 = 1 and 13/12 or 2 and 1/12 pizzas

That leaves 1 and 11/12 pizzas remaining (or 23/12 or 115/60)

Student 2 eats 1/5 of 115/60

1/5 of 115/60 = 23/60 of a pizza eaten by student 2 (about 1/3 of a whole pizza)

That leaves 92/60 left for student 3, who eats 1/2

1/2 of 92/60 = 46/60 or 23/30 of a pizza (about 5/6 of a whole pizza)