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Word of the Day

invariable
Definition: (adjective) not changing or subject to change.
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Math Teaser

Problem
A group of 9 friends invest equally in a business opportunity that costs $20,000. If n more friends were to take part evenly in the investment...

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SAT* Tip of the Day

So What?
Math questions involving two equations and two unknowns can usually be combined into one equation with one unknown.
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