John is the son of Jacob.
So,
Jacob is the_____of John's father?

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

There are forty elephants and they have forty-fore heads. How can this be possible?

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

which number am I?

Can you spot the hidden girl in the picture below?

What came first, the chicken or the egg?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

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

Which wheel of car does not rotate when you turn your car right?