How many words can a pen with half refill write?

Decode below rebus
D
N
A
T
S , D

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

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

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

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?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

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

Solve the puzzle by telling what does below picture means.

On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?