He saw a bird . change voice ​

A bird shooter was asked how many birds he had in the bag. He replied that there were all sparrows but six, all pigeons but six, and all ducks but six. How many birds had he in all?

A bird shooter was asked how many birds he had in the bag. He replied that there were all sparrows but six, all pigeons but six, and all ducks but six. How many birds he had in the bag in all ?

It is possible to recognise a person by hearing his voice even if he is hidden behind a wall. This is due to the fact that his voice