Solution:

The girl was born before(in front of) her mother.

Solution:

Third Image

Explanation
It's the only image that is not symmetric around the vertical axis as illustrated in the picture below.

Solution:

64 Squares on Chess Board.

Solution:

One In Million

Solution:

The answer to this stupidest riddle ever is "NO", because the question is "Can you guess the riddle?"

Solution:

He was watching an emotional movie where an old lady died.

Solution:

It is a mango tree.

Solution:

989

Solution:

0.5

Explanation:
Rachel Age = 10.5
Diana Age = 0.5
10.5 + 0.5 = 11

Many must have guessed the answer as 1.

Solution:

Win percentages of both team before the series is less than 50%.