Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Out of four images which one is the odd one out?

There is a circular car race track of 10km. There are two cars, Car A and Car B. And they are at the exact opposite end to each other. At Time T(0), Both cars move toward each other at a constant speed of 100 m/seconds. As we know both cars are at the same speed they will always be the exact opposite to each other.
Note, at the center, there is a bug which starts flying towards Car A at time T(0). When the bug reaches car B, it turns back and starts moving towards the car A. The speed of bug is 1m/second. After 5 hours all three stop moving.
What is the total distance covered by the bug?

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

Why do you find that most of the buildings are deprived of the 13th floor?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?