What happened when the wheel was invented?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

You can hear me, but you can't touch or see me.

What am I?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

I taste better than I can smell. Who am I?

Can you solve the below geography rebus by decoding the below rebus ?

Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?

Solve the riddle below:

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