What is black when you buy it, red when you use it, and gray when you throw it away?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

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

What word begins and ends with an E, but has only one letter?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98