Why is the Hole below a Lock?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Why Aeroplane windows are round?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

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?

Can you find out the missing number in the grid?

What jumps when it walks and sits when it stands?

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

Who am I?

A woman who works in a sweet shop has a measurement of 32-26-36, is 5"4" tall, and wears size "6" shoes. What do you think she weighs?

Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?