How can you make number one disappear by adding something to it?

What occurs twice in a week, once in a year but never in a day?

Find the 8 in the below-given Image.

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

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

No one wants to have it, but if one got it, he does not want to lose it. What is It?

In a town, there are over 100 flats.
Flat-1 is named first flat.
Flat-2 is named second flat.
Flat-3 is named third flat.

A visitors 'Victor' decides to walk through all the flats, he finds all the flats except flat-62.
Victor later founds that the local of the town have given it another name.

What is the name of the Flat?

How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?