Required Mathematical Intelligence

Chapter 30 Quick Answers

(1) There are 6 birds on the tree, if one is shot down with a gun, how many are left?

(2) There are 10 fish in the tank, 3 of which died, how many fish are left?

(3) For a quadrilateral board, one corner is cut off with a knife, how many corners are left?

(4) A troop of the People's Liberation Army is walking on the road. There are 10 people in front and 10 people in the back. How many of them are there?

(5) If two people stand in opposite directions, if they want to see each other, how many mirrors are needed at least?
(6) 10 children play hide-and-seek, 5 of them have been caught, how many are still missing?
(7) If the sky is cloudy at noon today, is it possible to see the sun in 10 hours?

(8) How many characters are there in the Internationale?
[Answers: (1) One did not, and the rest flew.

(2) 10, dead fish are also fish.

(3) Not necessarily.If it is cut along the diagonal, there will be three corners left; if it is cut from one corner to the opposite side, then four corners will be left; if it is cut from one side to the adjacent side, then five corners will be left One more corner.

(4) 9 people, 11 people in total.The front, back and middle in the question are relative.

(5) No one is needed, just two people face to face.

(6) There are 4 more, this is a game where one person catches nine people.

(7) Impossible, there will be no sun in the middle of the night.

(8) Three characters, namely: country, international, song. ]
(End of this chapter)