Занимательные задачи для детей и взрослых

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Для укрепления памяти необходимо развивать ум. Помогают этому занимательные задачи. Развивать логическое мышление никогда не поздно. Попробуйте разгадать наши задачки, не подсматривая в ответы.

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1.На всех трех железных банках с печеньем перепутаны этикетки: «Овсяное печенье», «Песочное печенье» и «Шоколадное печенье». Банки закрыты, и вы можете взять только одно печенье из одной (любой) банки, а потом правильно расположить этикетки. Как это сделать?

2. Доктор прописал человеку три таблетки, сказав, что он должен их принимать по одной через каждые полчаса. Через какое время после начала лечения человек выпьет самую последнюю — третью таблетку?

3. У крестьянина есть 6 кусков цепи по 5 звеньев в каждом, из которых он хочет сделать одну длинную и замкнутую цепь, состоящую из 30 звеньев. Разрезать одно звено стоит 8 копеек, а вновь соединить его — 18 копеек. Однако можно просто купить новую замкнутую цепь из 30 звеньев за полтора рубля. Каким образом возможно изготовить цепь из имеющихся б кусков и сколько денег при этом можно сэкономить?

ОТВЕТЫ:

1.Надо взять печенье из банки с надписью «Овсяное печенье» (можно и из любой другой). Так как банка надписана неправильно, то это будет песочное печенье или шоколадное. Допустим, вы достали песочное. После этого надо поменять местами этикетки «Овсяное печенье» и «Песочное печенье». А поскольку по условию все этикетки перепутаны, то теперь в банке с надписью «Шоколадное печенье» находится овсяное, а в банке с надписью «Овсяное печенье» находится шоколадное, значит, надо поменять местами и эти две этикетки.

2.На первый взгляд может показаться, что человек выпьет последнюю таблетку через полтора часа, ведь это именно три раза по полчаса. На самом же деле он выпьет последнюю таблетку не через полтора часа, а через час. Представим себе, что он выпивает первую таблетку. Проходит полчаса. Он выпивает вторую таблетку. Проходит еще полчаса. Он выпивает третью таблетку. Стало быть, человек выпьет последнюю таблетку через час после начала лечения.

3.Надо распилить все 5 звеньев одного куска и с их помощью соединить остальные 5 кусков. При этом общая стоимость работ составит 1 руб. 30 коп., что на 20 коп. дешевле стоимости новой цепи.

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