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14 Aug 2018, 03:11
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
100% (01:10) correct
0%
(00:00)
wrong
based on 8
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What is the value of 1/(x + 4)?
(1) 4.375x – 6.25 = 11.25
(2) 1/(x + 8) - 148 = 116
(1) 4.375x – 6.25 = 11.25
(2) 1/(x + 8) - 148 = 116
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14 Aug 2018, 04:19
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Bunuel
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)
14 Aug 2018, 04:29
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Bunuel
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 recommended
Question : value of 1/(x + 4) = ?
To answer this question we only need a unique value of x
Statement 1: 4.375x – 6.25 = 11.25
Now 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 = 116
Again, 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
