Let's start with a very simple observation. Take sheets of white and black paper, put them near each other, and make the room completely dark. Then you won't see them, because both sheets will be equally black.
سیاه تر از سیاه
Let's start with a very simple observation. Take sheets of white and black paper, put them near each other, and make the room completely dark. Then you won't see them, because both sheets will be equally black. |
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At a certainsport event, 100 students took part in track-and-field events,50 students participated in swimming, and 48 in sharpshooting. It turned out that the number of students who took part in only one event was twice as high as that who took part in just two events and three times as high as the number of students who participated in exactly three events. What is the total number of students that participated in the events?
Four hot plates are used simultaneously to fry cutlets. Connections of the hot plates and their resistances are as shown. On which hot plate will the cutlets be ready first?
Two circular towers are the same height but have different diameters. A spiral staircases runs around each of the towers from top to bottom. The slop pf the staircases are identical and constant. Which staircase is longer?
Arrange 11 non overlapping equal squares on the plane in pairs such that, for any coloring of these squares in three colors, there exist two identically painted squares that touch each other along a side.