What is the next number in the series?

15 29 56 108 208 ?

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

I have Rs.50 and I spend it in the way as below.

why number 8549176320 is one of a kind?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Buy me, smell me or deliver me, I do not change.

Who am I?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Take away the whole and some still remain. What is it?