The number of objects described in which situation can be represented by 24 ÷ 4 ?
1. There are 24 boxes with 4 pencils in each box.
2. There are 24 people on a bus, and 4 people get off the bus.
3. There are 24 marbles that need to be sorted into 4 equal groups.
4. There are 24 books on a shelf, and 4 more books are put on the shelf