Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Can you replace the question mark with the correct number?

What word does this rebus represent?

meta meta
meta meta

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Solve the riddle below:

If a Chicken says, 'All chickens are liars" is the chicken telling the truth?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT