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1. Age calculation

Five people sat together and asked how old the fifth person was. He said he was two years older than the fourth. When asked about the age of the fourth person, he said that he was 2 years older than the third person. Ask the third person and say that he is two years older than the second person. Ask the second person that he is two years older than the first one. Finally, the first person was asked, and he said he was 10 years old. How old is the fifth person, please?

The simplification of this question is to find out what the fifth item of a proportional series is!

1.1 graphical problems

According to mathematical thinking, it can be concluded that the number can be classified as a group of isometric series:

An=2 (n − 1) + 10

Now that the problem is extracted here, all that's left is how to implement it in code:

1.2 Code Resolution

1.2.1 Python implementation code

Def age (): # Interactive interface-enter the number n = int of the query (input ("how old do you need:") no_1 = 10 if n

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