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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
71% (01:32) correct
29%
(02:10)
wrong
based on 195
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If \(x = \frac{9b - 3ab}{\frac{3}{a} - \frac{a}{3}}\), what is x?
(1) \(\frac{9ab}{3+a} = \frac{18}{5}\)
(2) \(b = 1\)
(1) \(\frac{9ab}{3+a} = \frac{18}{5}\)
(2) \(b = 1\)
29 Sep 2021, 01:44
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1) Looking at the top line alone: 9ab = 18 tells us that either one of a or b is 2 and the other is 1.
Looking at the bottom line: 3+a = 5 tells us that a = 2, and therefore b = 1
SUFFICIENT
2) Only gives us the value of b, and we cannot deduce a from this.
INSUFFICIENT
Answer A
Looking at the bottom line: 3+a = 5 tells us that a = 2, and therefore b = 1
SUFFICIENT
2) Only gives us the value of b, and we cannot deduce a from this.
INSUFFICIENT
Answer A
29 Sep 2021, 02:25
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Bunuel
If \(x = \frac{9b - 3ab}{\frac{3}{a} - \frac{a}{3}}\), what is x?
(1) \(\frac{9ab}{3+a} = \frac{18}{5}\)
(2) \(b = 1\)
(1) \(\frac{9ab}{3+a} = \frac{18}{5}\)
(2) \(b = 1\)
THrough simplification we get 3b* (3-a) * 3a / 3-a * 3+a
=>9ab/ 3-a
Clearly A is sufficient we cannot sovle with B since 2 variables cannot be solved in 1 equation
Therefore IMO A
