What number when divided in half becomes zero?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

When 99 is considered higher than 100?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

I shave every day, but my beard stays the same. What am I?

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?