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Puzzle 25: Ten Rows

It is easy to arrange 16 chips into 10 rows of 4 chips in each row.  But, it is harder to arrange 9 chips into 10 rows of 3 chips in each row.  Can you solve both?

Extension: Using 10 chips, create 5 rows of 4 chips in each row.  Using 7 chips, create 6 rows of 3 chips in each row.