Erik's Ice Cream Shop sold 97 sundaes. 68 of the sundaes had nuts on top. What is the ratio of the number of sundaes with nuts to the number of sundaes without nuts?
Write your answer as two numbers separated by a colon (for example, 2:3).
The number of sundaes with nuts is 68 and the number of sundaes without nuts is 97 - 68 = <<97-68=29>>29.
The ratio of the number of sundaes with nuts to the number of sundaes without nuts is 68:29. Answer: \boxed{68:29}.