Hi viktorija,

We can answer this DS question by TESTing VALUES. We just have to make sure to be thorough with what we're TESTing:

We're asked if |2A - B| < 7. This is a YES/NO question.

Fact 1: 2A - B < 7

IF...

A = 0

B = 1

|0 - 1| = |-1| = 1 and the answer to the question is YES

IF...

A = 0

B = 10

|0 - 10| = |-10| = 10 and the answer to the question is NO

Fact 1 is INSUFFICIENT

Fact 2: A = B + 3

IF...

B = 0

A = 3

|6 - 0| = |6| = 6 and the answer to the question is YES

IF....

B = 1

A = 4

|8 - 1| = | 7| = 7 and the answer to the question is NO

Fact 2 is INSUFFICIENT

Combined, we know:

2A - B < 7

A = B + 3

We can substitute in the value of A and get...

2(B+3) - B < 7

2B + 6 - B < 7

B < 1

So whatever we TEST for B, it MUST be < 1

IF....

B = 0

A = 3

|6 - 0| = |6| = 6 and the answer to the question is YES

B can be ANY negative number though, so what happens if we take B to an 'extreme'....?

IF....

B = -100

A = -97

|-194 - (-100)| = |-94| = 94 and the answer to the question is NO

Combined, INSUFFICIENT

Final Answer:

GMAT assassins aren't born, they're made,

Rich

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Rich.C@empowergmat.com

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