Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

What is harder to catch the faster you run?

The more it dries, the wetter it becomes. Can you tell what it is?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

There is a jar in which there are two types of candies.
20 blueberries and 16 strawberries. You perform the following steps:
1) You take out two candies.
2) If the two candies are of the same flavour, you add a blueberry one otherwise, you add the strawberry one.

You repeat these two steps till there is just one candy remaining in the jar. Which flavoured candy will be left?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What part of the chicken has the most feathers?