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Invent a word problem

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I need to better understand - how to invent a word problem calling for an algebraic solution (i.e. variables instead of numbers). Please provide one or two examples with solutions. Thanks.

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Hi,

To invent a word problem you first think of a scenario and from there you can start developing what are the given, what is being asked, and the conditions stated in the problem. Examples are:

1. In a 100-item quiz, a student needs to get at least 70 correct answers to pass. Jane took the test and ...

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