Solving entrance exam and competition questions about PA and PG
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Questions from this class: 1) (ENEM) Playing cards is an activity that stimulates reasoning. A traditional game is Solitaire, which uses 52 cards. Initially, seven columns are formed with the cards. The first column has one card, the second has two cards, the third has three cards, the fourth has four cards, and so on until the seventh column, which has seven cards, and what is left forms the pile, which are the cards not used in the columns. The number of cards that form the pile is 2) (UERJ) The population of an animal species is multiplied by the same factor after equal intervals of time. In the period from 1984 to 1996, this population went from 12,500 to 25,000 individuals. Consider that, for the same interval of time in the following years, the factor remains constant. The number of individuals in this population in 2032 will be approximately equal to: 3) (EFOMM) A bottle contains 3 liters of wine. One liter of wine is removed from the demijohn and one liter of water is added, thus obtaining a homogeneous mixture. Then one liter of this mixture is removed and one liter of water is added, and so on. The quantity of wine, in liters, remaining in the demijohn, after 5 of these operations, is approximately equal to:
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