What goes up but never comes down?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

I always drive my customer away.

Who am I?

If 1+9+8=1, what is 2+8+9?

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