Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?

I am an odd number. Take away a letter and I become even. What number am I?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

A guy in his thirties is found dead in a forest. The shocking thing about the body is that he is wearing his swimming trunks snorkel and a facemask.

For your information, the nearest lake is some 10 miles away and the sea is hundreds of miles away.

How did he die then?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

Which is heavier: a ton of bricks or a ton of feathers?

Spot 5 differences in two Christmas tree below:

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211