If eleven plus two equals one, what does nine plus five equal?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

A king sentenced a man to the death sentence for some crime he had committed. Known for his kindness, the king told the culprit that he had a choice to die in a way he decides.

The culprit was clever and said something that saved him from death. What method do you think he must have chosen for his death?

A spaceship was lost. The detective was given a piece of paper. This was the location of the spaceship! This is what the slip had scribbled on it:
Juice, Umbrella, Potato, Ice, Tomato, Elephant, Rice.

Where is the spaceship?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?