What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

When does a USA Potato change its nationality?

Find the missing number in the image below.

A sundial has the fewest moving parts of any timepiece. Which has the most?

In a supermarket, there is an intelligent glass pane before a refrigerating unit. This glass pane allows cherries and apples through it but does not allow grapes and Orange to pass through it.

Can you identify the rule that the glass pane is following?

Be active and find the killer in the picture Riddle below.

A fresher was sitting in an interview. The interviewer said, "This is the last question of your interview. Tell me the accurate position of the centre of this table where your resume is kept."

How can he answer this question? What will you have answered to such a question?

You are playing as white and given four rooks to checkmate the black king in four moves with the following rules 1. You can place one rook every move and ensure the black king should be in check position.2. After four moves the black king should be in the checkmate position.