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Obtain 24
MathematicsUsing numbers 1,3,4,6, and basic arithmetic operations (addition, subtraction, multiplication, and division) and parentheses, obtain and an expression that evaluates to 24. You may use only these numbers and only these operations. Every number should be used exactly once. Numbers cannot be concatenated, i.e. you cannot use 13 or 146.
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The fifth number
MathematicsThe set of numbers 1,3,8,120 has a remarkable property: the product of any two numbers is a perfect square minus one. Find a fifth number that could be added to the set preserving its property.
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An elevator button
LogicA 12 story building has a single elevator. Two people live on the first floor, four - on the second floor, et cetera. Which button in the elevator is most frequently pushed?
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A bear in a window
For childrenA house has four walls each facing South. Each wall has a window. A bear is seen in a window. What color is the bear?
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Indeterminate color
RiddlesA certain subject caught the attention of a walking couple. They started to argue. He said: It's red. She said: No, it's black. He shot back: Yeah? Then why is it white? She replied: Because it's green, silly. What are they arguing about?
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