Solution:

24 13 11 5
----------
24 0 0 0
11 13 0 0
6 13 0 5
6 2 11 5
8 0 11 5
8 5 11 0
8 13 3 0
8 8 3 5
8 8 8 0

Solution:

only 6

Solution:

Bob was in China in 2012 & he killed Anderson.

Anderson died of suffocation=>This information should lead you to statement #3 next. From here you should gather that Bob killed Anderson.
Thus leading to statement #4, Bob was in China in 2012.

Solution:

Little Johny have Rupees 99.98 in his wallet when he entered the store.

Solution:

1. Start both the 7 minute hour glass & 11 minute hour glass.
2. Wait till the 7 minute hour glass times out. Time is 7 minute!
3. Restart the 7 minute hour glass. At this time 11 minute hour glass will have 4 minutes left to time out.
4. As soon as 11 minute glass times out invert the 7 minute hour glass. Total time now is 11 minutes.
5. After inverting 7 minute hour glass, it will now have 4 minutes left for time out.
6. After these 4 minutes times out, the total time is 15 minutes.

Solution:

1

As stated
1=6 => 6=1

Solution:

Youssef is name of a man , and out of 11 people only one is male

Solution:

Caesar is a King
Brutus is a Spy
Cassius is a Bureaucrat

Brutus is not the king, since if he is, then Caesar would also be the king.
Cassius is not the king, since his statement would then be a lie.

Therefore Caesar is the king. Hence Cassius is the bureaucrat, and Brutus is the spy.

Solution:

False- if he had instantly died, how would anybody know his dream

Solution:

Rose bought lilies, Lily bought jasmines and Jasmine - roses. By the condition, the girl, who bought the roses isn't Rose. She's not Lily either, because Lily answered to that girl. So, the roses were bought by Jasmine, and thus lilies were bought by Rose and jasmines by Lily.