Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

Christina is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named John, who is older than Christina, who's the youngest?

Prove that the below maths equation is true.

8 + 8 = 91

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

I have teeth but i don't bite. Who Am I ?

Count the number of triangles in the given picture.

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

What kind of tree can you carry in your hand?