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Word of the Day
sustain
Definition: (verb) to keep in existence or continue.
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Math Teaser
Problem
Each member of a research group visited either the Virgin Islands or Hawaii...
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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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SAT: Multiple-Choice Question #6

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Question: When 13 is divided by the positive integer b, the remainder is b - 2. Which of the following could be the value of b?

Choices:
A. 2
B. 4
C. 5
D. 7
E. 8

We could try dividing 13 by a bunch of values until we stumbled on the right answer, but let's try working backwards, instead. Start with choice (C): when 13 is divided by 5, is the remainder 5 - 2 = 3? Yes, it is: 13 divided by 5 is 2, remainder 3. Choice (C) is the correct answer.

If choice (C) had not been correct, we would have tried the other answer choices until we landed on the right one, and we still probably would have saved time over a hit-and-miss approach.

 

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