Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What has lots of eyes, but can’t see?

Count the Triangle in the figure given below:

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

How many times can you subtract the number two from the number fifty?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

John was drowned by he was not wet. How?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?