Tim is 5 years old. His cousin, Rommel, is thrice as old as he is. His other cousin, Jenny, is 2 years older than Rommel. How many years younger is Tim than Jenny? Let's think first. Chain of thought:
Rommel is 5 x 3 = 15 years old. Jenny is 15 + 2 = 17 years old. So, Tim is 17 - 5 = 12 years younger than Jenny.
Therefore, the answer is 12.