Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Consider this: Arnold Schwarzenegger has a big one. Michael J. Fox has a small one. Prince doesn’t have one. The Pope has one but never uses it. Bill Clinton has one and uses it all the time. What is it?

Seven Robbers robbed a bank and hide the coins in a lonely place.
They decide to divide the money equally the next morning. Two greedy robbers decided to cheat the others and reach the place at night. They equally divided the coins between them, one coin left. So they called another robber and then they decided to divide equally among the three. Sadly again one coin left. The same thing happened to the 4th 5th and the 6th robber.
However, when the 7th robber reached in the morning, they can divide the coins equally.

How many coins were there in total?

The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

Can you tell us the current time?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

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?

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?

How many times do a clock's hands overlap in a day ?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?