I take the bus from work home. Nearby, a very joyful, loud and emotionally young father teaches his young son arithmetic, drawing examples with his finger on the glass and making up tasks. After 15 minutes, the following text begins:
A: Count Dragon flew to one village and eaten there five peaceful houses, then he flew to another village and eaten there five civilians. How many people did he eat?
And ten of them!
A: It is right. But here one resident did not digest, got out of his stomach, generally, stuck in his teeth. How many inhabitants are left in the stomach of the dragon?
C is nine
A : Yes. Then he flew to another village and ate three civilians there. How much is in
The stomach?
Didn’t anyone survive this time?
A: No, I ate the whole village.
C: three... no, twelve!
A: Then came Dobryna Nikitich and spat the dragon's belly, and released seven peaceful men from there.
The residents...
C: Wow, I’m not so friends with you!
Oh, and it is shrinking! Shake the stomach! How many people are in the stomach?
C is zero.
No, he only released five residents.
A: A is seven!
A: And at this time people in the belly "no missed", and they had two children.
A: for everyone?
A: There are not only two. How many people were in the stomach of the dragon?
C is nine!