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

Find the missing letter in the last circle logically in the given below picture.

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What is at the end of a rainbow?

I am working in a bus company. The company recently went under expansion and therefore there was not enough room for all the buses. As a result, twelve buses had to be stored outside.

If the company decides to expand the garage space by forty percent, enough space to accommodate the current buses will be created leaving enough space for twelve more buses if the need arises in future.

Can you calculate the number of buses that the company owns at present?

Alex opened 24 presents
Jonah opened 8 presents
Clara opened 1 present

Can you find out how many presents were opened by Candy?

You are driving down the road in your car on a wild, stormy night, when you pass by a bus stop and you see three people waiting for the bus

An old lady looks as if she is about to die.
An old friend who once saved your life.
The perfect partner you have been dreaming about.
Knowing that there can only be one passenger in your car, whom would you choose?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?