Tag Archives: Inverse Relations

SAT problem of the week, August 25, 2014 Solution

Hint for process of elimination: Since y and xy are both positive, x is also positive. Therefore y-x<y=15 . This eliminates choice E, leaving you with four choices. Some awareness about how big or small the answer should be, for example noting that x=8 , may help you eliminate choice D for being too big, and choice A for being too small.

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SAT problem of the week, August 25, 2014

If xy = 120 and y = 15 , then y-x=

  1. 5 (check answer)
  2. 7 (check answer)
  3. 8 (check answer)
  4. 12 (check answer)
  5. 15 (check answer)

Solutions, hints, and questions are welcomed. A full solution will be posted on the August 31st. If you would like to learn how to enter math formulas into this blog, visit the WordPress LaTeX tutorial page.