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Question: A son's age is the age of his dad's age's digits added together. The son is not nine or older. The dad is of legal age. The dad's age doesn’t end in a zero, and is more than twenty, but less than twenty-five. How old is the dad, and how old is the son?
Answer: The son is three, four, five, or six. If he is three the dad is twenty-one, if he is four the dad is twenty-two, etc.
Question: You have been poisoned by an evil scientist. He told you that the only antidote is the saliva of a gecko. He contains saliva of six different animals. A gecko, a lizard, a koala, a tapir, a giraffe, and a cow. He hasn’t labeled he test tubes containing the saliva f the animals. On the left is a table which four of the test tubes are one. On the right is a table which two of the test tubes are on. The lizards saliva is poisonous. The lizard and gecko test tubes are on the same table. The test tubes on the left are labelled 1, 2, 3, and 4. The gecko spit will not override the lizard poison. The lizard and gecko saliva are not right beside each other. You don't know where the cow test tube is. You know that the cow saliva is in 2 or 3 however. You know that the lizard test tube is not to the right of the cow. You only have time to drink two test tubes, which side do you run toward and which test tubes do you drink?
Answer: You go to the left side and drink 4 and 3. You don't go to the right because there are only two test tubes on the right, and the lizard poison overrides the antidote to the other poison. The cow is in 2, which means that the lizard is in either 1 or 4, if the cow is 2 that means that the gecko is in 1, 2, or 3. We have deducted that the lizard is 1 or 4, lizard and gecko can't be beside each other and we know that the cow is in 2, which makes it impossible for the lizard saliva to be 3 or 4. Using that we can conclude the lizard is in 1. We use three and four because the gecko, through deduction, is in 3 or 4.