GMAT Practice Question Set #1 (Question 1-3)

GMAT Integrated Reasoning  >  Two-Part Analysis Question # 1: Number of Computer Science Teachers  
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Between 2008 and 2012, the number of computer science teachers decreased despite a jump in computer science majors from 400 in 2008.
In the given expressions, T and S represent the percent change in the number of teachers and computer science students, respectively, over the four years and R represents the the number of computer science students per teacher in 2008.
Percent change in a quantity X is calculated using the formula
`((X_(recent)- X_(old) ) / X_(old))` * 100.
Select the expression that represents the number of teachers in 2012 and select the expression that represents the number of computer science students per teacher in 2012.

# of Teachers in 2012

# of Computer Science Students per Teacher in 2012

`(400/R)((100-T)/100)`

`R((100 + S) / (100 + T))`

`1/R` 

`R((100-T)/(100+S))`

`400/R ((100+T) / 100)` 

Video Explanation Part 1 of 3: Understanding the Question


Video Explanation Part 2 of 3: Attacking the Answer Choices


Video Explanation Part 3 of 3: Summarizing It All Up

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