What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

A pack of cards has 40 cards. You are blindfolded. Out of 40, 25 cards are facing down while 15 are facing up. You have been asked to divide this pack of cards into two decks - so that each deck contains an equal number of face-up cards. Remember, you are blindfolded.

How will you do it?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

What's a single-digit number with no value?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

In the picture given below, can you find out which digit will take place of the question mark?

John bought a new car. He has a habit of eating ice cream from a particular ice cream shop while returning home from office. Whenever, he eats strawberry ice cream, he faces no problem. But whenever, he eats chocolate ice cream, the car starts giving problem. At first, he thinks, it is just a co-incidence but when this awkward incident happens for 3-4 times, he reports this problem to the company.

The mechanic of the company checks but finds no problem at all. The next day, when he stops by to eat chocolate ice cream, the car again starts giving problem.

Can you find the possible reason?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?