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The coin collector

A collector has a certain amount of coins, all of different weights. If you remove the 3 heaviest coins, the total weight of all the coins you had decreases by 35%. If you remove the lightest 3 of the remaining coins, the total weight of these remaining coins decreases by 5/13. How many coins did the collector originally have?
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Child abuse, types of abuse and warning signs

Child abuse It is difficult to imagine someone intentionally harming a child. However, if today we are talking about something as terrible as this, it is because it is a sad reality that, unfortunately, is still far from disappearing, as studies show that approximately 1 in 20 children are mistreated each year.
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Multiple Intelligences: Space Intelligence

Space Intelligence is one of the most complex to write about. Different authors have contributed their views and the results of their research. It is an intelligence that covers from a game of chess, parking a car, playing soccer, sculpting a figure and many more tasks.
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Sumial to make oppositions or speak in public

Have you ever shaken your voice or have you turned red when speaking in public? It has happened to many of us on more than one occasion. It is so common that, with some frequency, there are people who resort to chemical solutions to counteract nerves such as the Sumial.
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What is Seitai and what are its benefits?

The Seitai Are you looking for information about what the Seitai is? In that case, you are in the best possible place, because we have created the most complete article to talk about what the Seitai is and what the benefits it can bring you. Content 1 What is the Seitai? 2 What benefits does it provide? 3 How to practice it?
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The square of squares

The rectangle in figure ABCD is divided into squares of various sizes. What is the height and width of the rectangle if we are told that the smallest square of all has 2 meters of side? Solution The height is 66 meters and width 64 meters. To solve this problem, we should color the squares: If we call x next to the red square, we have to: Side of the red square = x Side of the blue square = x + 2 Side of the green square = 2x + 2 Side of the black square = x + 4 Side of the orange square = x + 6 Side of the pink square = (x + 6) - (x - 2) = 8 Side of the yellow square = x +14 Side of the brown square = x + 22 As it must be fulfilled that the side of the green square must be equal to the side of brown minus that of red minus that of pink, we have to: 2x + 2 = x + 22 - (x - 8) where we get that x = 14.
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