I got question in which you didn't had to put any formula instead it was more by logic in which I got stuck
If you know the concepts and formulas, you can still use numbers even if they aren't provided. For example, if a question were to ask you something along the lines of "Gear A is the driving gear for Gear B. Gear A is larger than Gear B. What can be said about the gear ratio? 1.) The gear ratio is 1:1 2.) The gear ratio is greater than 1:1 (ie. 2:1, 3:1, 10:1, etc.) 3.) The gear ratio is less than 1:1 (ie. 1:2, 1:3, 1:10, etc.).
Even though the question doesn't provide an angular velocity or the number of teeth each gear has, it does tell you that one is larger than the other and that is all you need to know. In this case, you could simply choose 20 and 10 for gears A and B respectively. This same concept can be applied to many different questions. Throughout the course of my studies, this was often the best first step that you could take to answer any advanced question. "What happens when x goes to 0?", for example, was an immensely powerful and insightful question to ask.