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

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?

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?

Why do we preferably have round manhole covers and not square ones?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?