What word begins and ends with an E, but has only one letter?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

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

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

When did John make this statement?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?