Can you start the fire using two pieces of wood?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

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

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?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

Keyboard words are not in alphabetical order, Why?

By what process could you make a 'Tea-Table' into food?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?