Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

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

A man dies of old age on his 25 birthday. How is this possible?

If Japan and Panama decided to merge into a single country, probably people will name it Japanama.

Can you think of two more such country's unions that could produce similar names like Japanama by overlapping their three letters?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

While sitting in the Car, John suddenly finds that one of the wheels was missing. John noticed that a killer is approaching towards him. John cannot get out of the car.

How will John escape?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

What do the following words have in common?

Assess
Banana
Dresser
Grammar
Potato
Revive
Uneven
Voodoo

I know a nine-letter word having only one vowel.
Do you ?