Question

Денис ,Кирилл и Алёша несли пакеты с продуктами,и один из них потерял коробку конфет.На вопрос,кто из них это сделал,Денис ответил:Кирилл,Кирилл ответил:Это сделал Денис,Алёша:Это не я и не Кирилл.Кто из мальчиков потерял конфеты,если двое из них говорят правду,а один лжёт?

Answer 1

Денис конфеты потерял. 

Answer 2

Problem Analysis

Three boys, Denis, Kirill, and Alyosha, were carrying bags with groceries, and one of them lost a box of candies. Denis claims that Kirill is responsible, Kirill claims that Denis is responsible, and Alyosha denies being responsible and accuses neither Denis nor Kirill. We need to determine which of the boys lost the box of candies, assuming that two of them are telling the truth and one is lying.

Solution

To solve this problem, we need to analyze the statements made by the boys and identify any contradictions. Let's examine each statement:

1. Denis claims that Kirill is responsible. 2. Kirill claims that Denis is responsible. 3. Alyosha denies being responsible and accuses neither Denis nor Kirill.

If Denis is telling the truth, then Kirill must be responsible. However, if Kirill is telling the truth, then Denis must be responsible. These statements contradict each other, which means that one of them is lying.

Now let's consider Alyosha's statement. Alyosha denies being responsible and accuses neither Denis nor Kirill. If Alyosha is telling the truth, then neither Denis nor Kirill can be responsible. This means that Alyosha is not the one who lost the box of candies.

Since two of the boys are telling the truth and one is lying, we can conclude that Denis is the one who lost the box of candies. This is because if Denis is lying, then Kirill's statement would be true, which contradicts Alyosha's statement. Therefore, Denis must be telling the truth, and Kirill's statement is false.

To summarize: - Denis is telling the truth and Kirill is lying. - Alyosha is telling the truth and is not responsible. - Therefore, Denis is the one who lost the box of candies.

Please let me know if anything is unclear or if you have any further questions!