Treasure chests

The gnome separated his treasure into 3 different chests, each different
color, each standing by the wall. One chest had precious stones, one chest
had gold coins, and one chest had magic books. He remembers that red chest
is to the right of the one with the stone. And books are to the right of
the red chest. What chest contains books, if green chest is to the left of
the blue chest?

This is a problem on logic and the kids did it very successfully.
There were 9 kids in my class, so I divided them in 3 groups. Each group chose what they represent. One group was Precious stones, another was Gold coins, and the third was Magic books.
We all decided to put the 'Precious stones' team next to the wall. Kids realized that two other teams should stay on the right side from 'Precious stones'. They also found that one of those teams is red. Because 'Magic books' team on the right from red team it meant that 'Gold coins' team is red. Because green chest is to the left from blue chest it meant that 'Magic books' is blue and 'Precious stones' is green.
The problem is solved!