Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

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

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

What number should come in place of the question mark below?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

What always comes into a house through the keyhole?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

1 dollar = 100 cent
= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
= 1 cent

=> 1 dollar = 1 cent

solve this tricky problem?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

John leaves home and then he takes three right turns. John wants to return to home but he was scared of Jacob, who is wearing a mask.

What is John Situation ?