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Value of N?

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Value of N?

by kop » Wed Nov 13, 2013 6:39 am
What is the value of n?

1. n is between 0 and 1
2. 7/16 is 3/8 more than n

I am unable to comprehend ST2. Please help
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Source: — Data Sufficiency |

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by Brent@GMATPrepNow » Wed Nov 13, 2013 7:35 am
kop wrote:What is the value of n?

1) n is between 0 and 1
2) 7/16 is 3/8 more than n
Target question: What is the value of n?

Statement 1: n is between 0 and 1
There are many possible values of n
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: 7/16 is 3/8 more than n
In other words, 7/16 is 3/8 greater than n
We can write this as 7/16 = n + 3/8
Since we COULD solve this equation to find the exact value of n (n = 1/16), statement 2 is SUFFICIENT

Answer = B

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by theCodeToGMAT » Wed Nov 13, 2013 8:57 am
To find: Value of "n"

Imp: We are not given that "n" is Integer

Statement 1:
N>0 & N<1
We can have any decimal value as value of "N"
For Example: 0.1, 0.2, etc
INSUFFICIENT

Statement 2:
n + 3/8 = 7/16
We can solve for "n"
SUFFICIENT

Answer [spoiler]{B}[/spoiler]
R A H U L
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by [email protected] » Wed Nov 13, 2013 5:52 pm
Hi kop,

Both Brent and Rahul have properly solved this DS question, but I wanted to emphasize a particular rule that you'll find useful on DS questions:

"One simple variable, one equation... I can solve it"

For example, X + 4 = 10

Here, we have one simple variable and one equation, which means we CAN solve it. In a DS question, we don't have to solve it to know that there is ONLY ONE ANSWER. By definition, with ONLY ONE answer, a Fact is considered SUFFICIENT, regardless of what the answer actually is.

In Fact 2, we're told that 7/16 = 3/8 + N

While this is a bit more complex-looking than normal, it is still just "one simple variable, one equation...", so you CAN solve it and answer the question. This is a SUFFICIENT piece of data.

GMAT assassins aren't born, they're made,
Rich
Contact Rich at [email protected]
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