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

No one wants to have it, but if one got it, he does not want to lose it. What is It?

An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

Two old friends, Jack and Jill, meet after a long time, and discussing as:

Jack: Hey, how are you, man?

Bill: Not bad, got married and I have three kids now.

Jack: That's awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don't know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh, now I get it.

How old are Bill's kids?

What goes up but never comes down?

What time is it when an elephant sits on a fence?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

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

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?