Yes, basic counting is important in solving an unknown. How did you stack up with this puzzle?
The 13C NMR spectrum below shows 7 signals in total, 3 intense signals and 4 weak signals. The 4 weak signals follow a quartet pattern produced by a CF3 group. The unknown contains a minimum of 4 C atoms.
BONUS You get 1 extra point for indicating that the unknown also contains a minimum of 3 F atoms.
Thank you Walter, Inamul and Adolph for your comments.