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

If you paint a brown house white it will become a white house. If the stoplight changes from red to green, then the light is green. So, if you throw a white shirt into the Red Sea, what will it become?

Seven Robbers robbed a bank and hide the coins in a lonely place.
They decide to divide the money equally the next morning. Two greedy robbers decided to cheat the others and reach the place at night. They equally divided the coins between them, one coin left. So they called another robber and then they decided to divide equally among the three. Sadly again one coin left. The same thing happened to the 4th 5th and the 6th robber.
However, when the 7th robber reached in the morning, they can divide the coins equally.

How many coins were there in total?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

The more you take me, the more you leave me behind.
Who Am I?

Consider this: Arnold Schwarzenegger has a big one. Michael J. Fox has a small one. Prince doesn’t have one. The Pope has one but never uses it. Bill Clinton has one and uses it all the time. What is it?

What does this Rebus Picture means ?

What can you hold in your right hand, but never in your left hand?

What is the word or phrase?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?