How can you make number one disappear by adding something to it?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Can you find a five letter word that is left with only two letters if one is removed?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Can you find out the remainder when 3^300 is divided by 5?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Can you replace the question mark with the correct number in the below table sequence?

A charming young lady was approached by a kind looking old woman in a restaurant. The old woman said to her, 'You look exactly like my younger daughter. Sadly she passed away a couple of months back. Could you do me a favor and say 'Goodbye, mother' with a kind smile on your face when I leave?

The young lady agreed for the same and said, 'Goodbye, mother' when the old woman left. Soon after, she got the most disengaging shock of her life.

Can you guess what the shock was?