Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

How can I get the answer 24 by only using the numbers 8,8,3,3?

You can use the main signs add, subtract multiply and divide.

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Why is the Hole below a Lock?

People put me on the table and cut me but do not eat me. What am I?

Can you find the mistake in the below statement?

Out of four images which one is the odd one out?

What is the centre of gravity?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?