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

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

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

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Find out the missing number in the picture attached: