You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

In the given picture, you can find two letters missing. When two particular letters are placed in the missing spots, you get an eight-letter word while reading in the anti-clockwise direction. Can you find out the missing letters and the missing word eventually?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

What begins with T, ends with T, and has T in it?

What goes up but never comes down?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

How many letters are in the alphabet?

You are a cab driver who pools passengers. You pick 3 people from a destination and drop 1 after an hour. 2 people climb aboard at the same time and you drop 3 at the next destination. After some time, you pick 2 passengers only to drop 1 after a short distance where 3 more passengers climb up the cab. You leave the rest of the passengers one by one to their destination and then come back home.

Can you tell the eye color of the cab driver?