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What is the value of 1/(x + 4)? (1) 4.375x – 6.25 = 11.25 (2) 1/(x
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14 Aug 2018, 02:11
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Re: What is the value of 1/(x + 4)? (1) 4.375x – 6.25 = 11.25 (2) 1/(x
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14 Aug 2018, 03:19
Bunuel wrote: What is the value of 1/(x + 4)?
(1) 4.375x – 6.25 = 11.25
(2) 1/(x + 8)  148 = 116 St1: 4.375x – 6.25 = 11.25 One equation , one variable. value of x can be determined. hence, value of 1/(x+4) ca be determined. On solving x=4. Sufficient. St2: \(\frac{1}{(x + 8)}\)  148 = 116 Or, \(\frac{1}{(x+8)}\)=264 Or, \(x+8=\frac{1}{264}\) Or, x+8=0 (Approx.) Or, x=8 But x can't be 8. (1/(x+8)=1/0 is undefined) Insufficient. Ans. (A)
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Re: What is the value of 1/(x + 4)? (1) 4.375x – 6.25 = 11.25 (2) 1/(x
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14 Aug 2018, 03:29
Bunuel wrote: What is the value of 1/(x + 4)?
(1) 4.375x – 6.25 = 11.25
(2) 1/(x + 8)  148 = 116 DS RULE: To solve DS questions we have to only ensure whether information given in statement(s) is sufficient or not therefore as long as we are sure that we will get a Unique answer to the question, we can skip the calculation part and save on time. it is highly recommendedQuestion : value of 1/(x + 4) = ?To answer this question we only need a unique value of xStatement 1: 4.375x – 6.25 = 11.25Now save your time and avoid solving it further because this is the equation in one variable so there will be a unique value of x after solving this hence SUFFICIENT Statement 2: 1/(x + 8)  148 = 116Again, save your time and avoid solving it further because this is the equation in one variable so there will be a unique value of x after solving this hence SUFFICIENT Answer: option D
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What is the value of 1/(x + 4)? (1) 4.375x – 6.25 = 11.25 (2) 1/(x
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14 Aug 2018, 03:34
PKN wrote: Bunuel wrote: What is the value of 1/(x + 4)?
(1) 4.375x – 6.25 = 11.25
(2) 1/(x + 8)  148 = 116 St1: 4.375x – 6.25 = 11.25 One equation , one variable. value of x can be determined. hence, value of 1/(x+4) ca be determined. On solving x=4. Sufficient. St2: \(\frac{1}{(x + 8)}\)  148 = 116 Or, \(\frac{1}{(x+8)}\)=264 Or, \(x+8=\frac{1}{264}\) Or, x+8=0 (Approx.) Or, x=8But x can't be 8. (1/(x+8)=1/0 is undefined) Insufficient. Ans. (A) in GMAT Quant, Approximately zero does NOT mean Zero unless Question expects and mentions to approximate
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Re: What is the value of 1/(x + 4)? (1) 4.375x – 6.25 = 11.25 (2) 1/(x
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14 Aug 2018, 03:40
PKN wrote: Bunuel wrote: What is the value of 1/(x + 4)?
(1) 4.375x – 6.25 = 11.25
(2) 1/(x + 8)  148 = 116 St1: 4.375x – 6.25 = 11.25 One equation , one variable. value of x can be determined. hence, value of 1/(x+4) ca be determined. On solving x=4. Sufficient. St2: \(\frac{1}{(x + 8)}\)  148 = 116 Or, \(\frac{1}{(x+8)}\)=264 Or, \(x+8=\frac{1}{264}\) Or, x+8=0 (Approx.) Or, x=8 But x can't be 8. (1/(x+8)=1/0 is undefined) Insufficient. Ans. (A) Hi PKN, IMO answer should be (D). In statement 2, even if the value is 0 we will be able to determine \(\frac{1}{(x + 4)}\) as undefined. Moreover value can be rounded off to zero but we can not say it is exactly zero. So, \(\frac{1}{(x+8)}\) will not equal \(\frac{1}{0}\), it will equal\(\frac{1}{0.00000001}\)(something like this)Hope it helps
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Re: What is the value of 1/(x + 4)? (1) 4.375x – 6.25 = 11.25 (2) 1/(x
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14 Aug 2018, 03:44
GMATinsight wrote: PKN wrote: Bunuel wrote: What is the value of 1/(x + 4)?
(1) 4.375x – 6.25 = 11.25
(2) 1/(x + 8)  148 = 116 St1: 4.375x – 6.25 = 11.25 One equation , one variable. value of x can be determined. hence, value of 1/(x+4) ca be determined. On solving x=4. Sufficient. St2: \(\frac{1}{(x + 8)}\)  148 = 116 Or, \(\frac{1}{(x+8)}\)=264 Or, \(x+8=\frac{1}{264}\) Or, x+8=0 (Approx.) Or, x=8But x can't be 8. (1/(x+8)=1/0 is undefined) Insufficient. Ans. (A) in GMAT Quant, Approximately zero does NOT mean Zero unless Question expects and mentions to approximateHi GMATinsight, Looking at both the statements, one can easily answer the question in 10 s. However, Does each of the statements yield same unique value? A standard GMAT DS value question(with option D as correct answer) always produce the same unique value at each of the statements.Request to clarify.
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Re: What is the value of 1/(x + 4)? (1) 4.375x – 6.25 = 11.25 (2) 1/(x
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14 Aug 2018, 03:46
adstudy wrote: PKN wrote: Bunuel wrote: What is the value of 1/(x + 4)?
(1) 4.375x – 6.25 = 11.25
(2) 1/(x + 8)  148 = 116 St1: 4.375x – 6.25 = 11.25 One equation , one variable. value of x can be determined. hence, value of 1/(x+4) ca be determined. On solving x=4. Sufficient. St2: \(\frac{1}{(x + 8)}\)  148 = 116 Or, \(\frac{1}{(x+8)}\)=264 Or, \(x+8=\frac{1}{264}\) Or, x+8=0 (Approx.) Or, x=8 But x can't be 8. (1/(x+8)=1/0 is undefined) Insufficient. Ans. (A) Hi PKN, IMO answer should be (D). In statement 2, even if the value is 0 we will be able to determine \(\frac{1}{(x + 4)}\) as undefined. Moreover value can be rounded off to zero but we can not say it is exactly zero. So, \(\frac{1}{(x+8)}\) will not equal \(\frac{1}{0}\), it will equal\(\frac{1}{0.00000001}\)(something like this)Hope it helps Approximation is totally wrong at my end. I did it knowingly. Do you get the the same unique value of x and 1/(x+4) from both the statements?
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Re: What is the value of 1/(x + 4)? (1) 4.375x – 6.25 = 11.25 (2) 1/(x
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14 Aug 2018, 04:09
PKN wrote: Approximation is totally wrong at my end. I did it knowingly.
Do you get the the same unique value of x and 1/(x+4) from both the statements?
Cannot say on this because never calculated further But I believe that even if it is different it is okay until we have a value. I guess we need an experts advice on it for confirming whether both statements need to give the same value. Because even if we don't have a unique value of both we still have a determined value of each. Let me know your view point on the same
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Re: What is the value of 1/(x + 4)? (1) 4.375x – 6.25 = 11.25 (2) 1/(x
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14 Aug 2018, 04:10
PKN wrote: PKN wrote: Bunuel wrote: What is the value of 1/(x + 4)?
(1) 4.375x – 6.25 = 11.25
(2) 1/(x + 8)  148 = 116 St1: 4.375x – 6.25 = 11.25 One equation , one variable. value of x can be determined. hence, value of 1/(x+4) ca be determined. On solving x=4. Sufficient. St2: \(\frac{1}{(x + 8)}\)  148 = 116 Or, \(\frac{1}{(x+8)}\)=264 Or, \(x+8=\frac{1}{264}\) Or, x+8=0 (Approx.) Or, x=8 But x can't be 8. (1/(x+8)=1/0 is undefined) Insufficient. Ans. (A) Hi PKN, IMO answer should be (D). In statement 2, even if the value is 0 we will be able to determine \(\frac{1}{(x + 4)}\) as undefined. Moreover value can be rounded off to zero but we can not say it is exactly zero. So, \(\frac{1}{(x+8)}\) will not equal \(\frac{1}{0}\), it will equal\(\frac{1}{0.00000001}\)(something like this)Hope it helps Approximation is totally wrong at my end. I did it knowingly. Do you get the the same unique value of x and 1/(x+4) from both the statements?[/quote] Absolutely correct observation and in such scenario we call the question with appropriate quality Bunuel : Please check the question and solution. The values from statements 1 and 2 are not the same violating the rule of GMAT.
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What is the value of 1/(x + 4)? (1) 4.375x – 6.25 = 11.25 (2) 1/(x
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14 Aug 2018, 04:11
adstudy wrote: PKN wrote: Approximation is totally wrong at my end. I did it knowingly.
Do you get the the same unique value of x and 1/(x+4) from both the statements?
Cannot say on this because never calculated further But I believe that even if it is different it is okay until we have a value. I guess we need an experts advice on it for confirming whether both statements need to give the same value. Because even if we don't have a unique value of both we still have a determined value of each. Let me know your view point on the same Hi adstudyNO, It's NOT OK for two statements to result in inconsistent and completely uncommon values. In GMAT level questions, such ambiguity does NOT exist.
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What is the value of 1/(x + 4)? (1) 4.375x – 6.25 = 11.25 (2) 1/(x &nbs
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