How to solve calendar questions

You wont get one in CAT.. Rest Assured....
If you do...use this...
every 4tth year is a leap year.....every 100th year is not a leap year.....but every 400th year is a leap year...
So in 400 year there are (100)-(4)+(1) = 97 leap years!
If you can remember this....its more than enough....