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Is t/3 > w/5 ?

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Is t/3 > w/5 ?  [#permalink]

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New post 10 Nov 2016, 22:56
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

75% (01:17) correct 25% (01:19) wrong based on 140 sessions

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Re: Is t/3 > w/5 ?  [#permalink]

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New post 11 Nov 2016, 12:41
Bunuel wrote:
Is t/3 > w/5 ?

(1) w > t
(2) 5t > 3w


Statement 1:

w=5, t=4; Yes

w=20, t=4; No

Insufficient

Statement 2:

Sufficient

B


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Re: Is t/3 > w/5 ?  [#permalink]

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New post 12 Nov 2016, 03:51
1
The answer i believe is B as if we rewrite the question its asking if 5T>3w.. which is stated in second option. Also the first option is of no help as it just states w>t ( we do not know to what extent w>b).
So only statement 2 would prove
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Re: Is t/3 > w/5 ?  [#permalink]

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New post 13 Nov 2016, 04:28
ProfX wrote:
Bunuel wrote:
Is t/3 > w/5 ?

(1) w > t
(2) 5t > 3w
answer is E. Use numbers both positive and negative


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You dont need positive or negative numbers for statement 2, since 5t>3w, you divide both sides by 3 and 5, which are positive numbers, you will get the inequality in the question stem.

so i got with B
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Re: Is t/3 > w/5 ?  [#permalink]

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New post 16 Dec 2017, 23:36
Bunuel wrote:
Is t/3 > w/5 ?

(1) w > t
(2) 5t > 3w


Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution.

Since we have 2 variables (t and w) and 0 equations, C is most likely to be the answer and so we should consider 1) & 2) first.

Conditions 1) and 2):
5t > 3w
⇔ t/3 > w/5
They are sufficient.

Since this is an inequaltiy question (one of the key question areas), we should also consider choices A and B by CMT 4(A).

Condition 1)
t = 3, w = 4 ⇒ t/3 = 1, w/5 = 4/5 and t/3 > w/5 : Yes
t = 3, w = 5 ⇒ t/3 = 1, w/5 = 1 and t/3 = w/5 : No
The condition is not sufficient.

Condition 2)
5t > 3w
⇔ t/3 > w/5
The condition 2) only is sufficient.

Therefore, B is the answer.

Normally, in problems which require 2 or more additional equations, such as those in which the original conditions include 2 variables, or 3 variables and 1 equation, or 4 variables and 2 equations, each of conditions 1) and 2) provide an additional equation. In these problems, the two key possibilities are that C is the answer (with probability 70%), and E is the answer (with probability 25%). Thus, there is only a 5% chance that A, B or D is the answer. This occurs in common mistake types 3 and 4. Since C (both conditions together are sufficient) is the most likely answer, we save time by first checking whether conditions 1) and 2) are sufficient, when taken together. Obviously, there may be cases in which the answer is A, B, D or E, but if conditions 1) and 2) are NOT sufficient when taken together, the answer must be E.
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Re: Is t/3 > w/5 ?   [#permalink] 16 Dec 2017, 23:36
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