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

Can you count the number of lines in the below picture?

A landlord calls both of his sons and tells them that their horses will now decide who will transfer the inheritance. He tells them to race along the land till the end and the one whose horse will be slower will win and be the heir to all the property.

Both of them keep wandering for days but to no result. Then they ask a wise man regarding it. The man advises them on the matter after which they jump on the horses and race as fast as they can till the end. Why did they do it?

What did the wise man say?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What does this rebus riddle means ?

Different lights make me strange by changing me into different sizes. What am I?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Can you spot the hidden girl in the picture below?

John and Jill are madly in love with each other. To remind Jill of his pure love, John wants to send her a ring by post but in their country where burglary is quite prominent, any package that is not locked comes under the risk of being stolen for the contents.

John and Jill possess many padlocks but neither one of them has the other key.

Can you find a way John can send the ring to Jill safely?