The riddle that almost "caused a war" in a pub will only be solved by the attentive: test yourself

Riddles force you to look for non-standard solutions and carefully analyze information. It trains logic, creativity, and the ability to think abstractly. Puzzles stimulate the brain, improving various cognitive functions, such as memory, attention, concentration, and reaction time. Solving logical problems requires the involvement of different parts of the brain, which contributes to the development of neural connections.

A challenging task is gaining popularity online. It is said that once it almost "caused a war" in a pub. The conditions are quite simple. A builder constructs 100 houses and has to put numbers on the doors. They are numbered from 1 to 100. How many 7s does the builder need?

This quiz question is said to have been known for quite some time and has been a source of heated debate for a long time.

Many "experts" insisted that they had accurately calculated the correct answer, but in fact they were wrong.

So, you should re-read the conditions of the problem and think about how many times the number 7 appears in the numbers from 1 to 100.

Solving puzzles often requires the use of short-term and long-term memory. For example, you need to memorize the terms of the problem, store information about previous stages of the solution, or keep several solutions in mind at the same time.

Logic puzzles are not just interesting games that help relieve stress or have fun. They also have a significant impact on the development of intelligence and critical thinking.

The correct answer

It is easy to count all the numbers ending in seven - 17, 27, 37, etc. If you remember that 77 requires two sevens, this method will lead you to 11 - and this is the most popular answer online.

But it's missing a key component - all numbers starting with seven. There are 10 numbers that start with seven, from 70 to 79. So, given all the numbers that start and end with seven, the correct answer is 20.

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