One of my favorite Quantitative Comparison strategies is called "Looking for Equality" (free video on this topic here: http://www.greenlighttestprep.com/modul ... on?id=1099).
In this strategy, I first look for scenarios that make the two quantities equal.

Consider these two cases:

Case #1:
Group A consists of two salaries: $40,610 and $40,610 [so the median salary = $40,610]
Group B consists of two salaries: $40,810 and $40,810 [so the median salary = $40,810]
When we combine the groups we get four salaries: $40610, $40610, $40810 and $40810
Here, the median = the average of the two middlemost salaries
So, median = ($40610 + $40810)/2 = $40710
We get:
Quantity A: $40,710
Quantity B: $40,710
Since the two quantities are EQUAL, the correct answer is EITHER C or D

Now try a different scenario:


Case #2:
Group A consists of two salaries: $40,610 and $40,610 [so the median salary = $40,610]
Group B consists of THREE salaries: $40,810, $40,810 and $40,810 [so the median salary = $40,810]
When we combine the groups we get five salaries: $40610, $40610, $40810, $40810 and $40810
Here, the median = $40,810
We get:
Quantity A: $40,810
Quantity B: $40,710
Since the two quantities are NOT EQUAL, the correct answer is

Cheers,
Brent