What does does this rebus picture means ?

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

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?

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

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

What Word am I Looking For ?

Why do you find that most of the buildings are deprived of the 13th floor?

A man dies of old age on his 25 birthday. How is this possible?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?