Einstein's riddles 1.7.7

Einstein's Riddle - the logic puzzle, according to legend, created by Albert Einstein during his childhood. It was used by Einstein to test candidates for assistants the ability to think logically.

Einstein claimed that only two percent of the world population are able to operate in the laws of the mind associated directly with five signs. As a consequence of this private, cast puzzle can be solved without the use of paper only to those who belong to the two percent.

In its most complex version of the problem involves the decision in the mind, without the use of any means of maintaining records or information.

To solve the problem it is necessary to use deductive steps, following which you can get a solution. The essence of the method is to try to write the known relationships into a table, consistently excluding the impossible variants, resulting in a completely filled table.