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Problems and answers in the first volume of junior one mathematics
1. Some students live in several rooms. If there are 4 people in each room, 20 people have no place to live. If there are 8 people in each room, there are only 4 people in one room. How many students are there?

There are x dormitories.

There are 4 people in each room, but 20 people can't arrange it.

So there are 4x+20 people.

There are 8 people in each room, and the last room is not empty and dissatisfied.

So x- 1 has eight people, and the last room has more than eight.

So 0