What is the next number in this matchsticks series riddle?

Name a key which is hardest to turn.

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

In the four images below, can you find the odd one out?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

John was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday.

Can you find out on what day was Jacob born?

What has lots of eyes, but can’t see?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *