If eleven plus two equals one, what does nine plus five equal?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

I have branches, but no fruit, trunk or leaves. What am I?

Can you name some countries which do not have the alphabet 'A' in them?

There is something which is always coming but never arrives?

At the local model boat club, four friends were talking about their boats.

There were a total of eight boats, two in each colour, red, green, blue and yellow. Each friend owned two boats. No friend had two boats of the same colour.

Alan didn't have a yellow boat. Brian didn't have a red boat but did have a green one. One of the friends had a yellow boat and a blue boat and another friend had a green boat and a blue boat. Charles had a yellow boat. Darren had a blue boat, but didn't have a green one.

Can you work out which friend had which coloured boats?

What four weights can be used to balance from 1 to 30 pounds?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?