Pupils in states

In Arnold's world of 5 identical states, all states have exactly 100 cities. In each city there are 30 schools, in each 9 grades, in each grade 4 classes, in each class 25 pupils.

a- how many pupils attend schools in 1 city
b- how many pupils attend schools in 30 cities
c- how many pupils attend schools in 1 state
how many pupils attend schools in Arnold's world

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