GMAT Data Sufficiency (DS) | Re: Is it true that a > b ? (1) 3a > 5b (2) –a

0akshay0 Lithium
Note that it is not stated whether a and b are positive numbers. This is one way for gmat to trick you. Don't fall for it and test negative numbers as well.

The correct answer is B and here is why:
1) 3a > 5b --> let's assume a=5; b= 2 --> 15>10 --> a>b stands.
However, if we assume that a = -3 and b= -2, it goes that -9>-10, but b>a. NOT sufficient.
2) clearly sufficient *-1 both sides and < changes to >

Hope this helped.