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The Ages of Three Children puzzle (sometimes referred to as the Census-Taker Problem [1]) is a logical puzzle in number theory which on first inspection seems to have insufficient information to solve. However, with closer examination and persistence by the solver, the question reveals its hidden mathematical clues, especially when the solver ...
Bernard: Of course we know the bus number, but we still don't know your age. Cheryl: Oh, I forgot to tell you that my brothers have the same age. Albert and Bernard: Oh, now we know your age. So what is Cheryl's age? [13] Note that this problem is a slight variation of another problem, previously presented by Martin Gardner. [14]
How to Solve It suggests the following steps when solving a mathematical problem: . First, you have to understand the problem. [2]After understanding, make a plan. [3]Carry out the plan.
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More recently, a simpler version has been used to study how students react to word problems: A captain owns 26 sheep and 10 goats. How old is the captain? [4] Many children in elementary school, from different parts of the world, attempt to "solve" this nonsensical problem by giving the answer 36, obtained by adding the numbers 26 and 10.
The abstract thought experiment is: "Suppose that one of the variables is doubled in value, how will the other variable change?" If the answer is "double", then this may be a constant ratio problem. But if the answer is not double, such as for the age problem with Mr. Tall and Mr. Short given above, then it is not a constant ratio problem.
In addition, researchers found that people in the middle group had an average brain age that was 1.6 years older than those in the low group, and those in the high group had an average brain age ...
Prior to the study, he had a chronological age of 71 and a biological age of 57.6. He had his biological age tested again at eight weeks, despite having withdrawn from the study, and it had ...