Question

Chan bought some pencils for a group of students If he gives them 2 pencils each, he will have 10 pencils left.If he gives them 3 pencils each, he will have none left Howmany students are in the group?

Answer 1

He has 10 students.
If he give 2 each, that's 20 pencils, but he has 10 left.
If he give 3 each, that's 30. No pencils left over.