How many words can a pen with half refill write?

If two's company, and three's a crowd, then whats four and five ?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

Replace the question mark with the correct number in below Picture:

The more of this there is, the less you see. What is it?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Before Mount Everest was discovered, what was the highest mountain in the world?

An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?