Miquel thinks of a number.
He multiplies this number by 8 then subtracts 9.
His answer is 47. What was Miquel's original number?
Miquel's friend thinks of a number.
He then does the following operations:
Multiply by 3, subtract 7, multiply by 2 then add 62 (in that order). He finds that the number he ends up with is 12 times his original number.
What was Miquel's friend's original number?
Change NumbersEasier Questions
Topics: Starter  Algebra  Functions
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Numbers and the Making of UsI initially heard this book described on the Grammar Girl podcast and immediately went to find out more about it. I now have it on my Christmas present wish list and am looking forward to receiving a copy (hint!). "Caleb Everett provides a fascinating account of the development of human numeracy, from innate abilities to the complexities of agricultural and trading societies, all viewed against the general background of human cultural evolution. He successfully draws together insights from linguistics, cognitive psychology, anthropology, and archaeology in a way that is accessible to the general reader as well as to specialists." more... 
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Here is the URL which will take them to the Think Of A Number exercise.
Here is the URL which will you to our eQuation Generator which provides unlimited practice solving linear equations.