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Is S < T? (1) R = T/2 (2) S = R/2

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Director
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Is S < T? (1) R = T/2 (2) S = R/2  [#permalink]

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New post 22 Sep 2018, 20:01
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

49% (01:10) correct 51% (00:43) wrong based on 58 sessions

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Is \(S < T\)?

(1) \(R = T/2\)

(2) \(S = R/2\)

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Re: Is S < T? (1) R = T/2 (2) S = R/2  [#permalink]

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New post 22 Sep 2018, 21:51
Is S<T?

St 1: R =T/2
=>2R=T
We have no information about S. Hence proved insufficient. AD

St2: S=R/2
=>2S=R
We have no information about T. Hence proved insufficient.BCE

St 1 & St 2: 2R=T & 2S=R

Case 1: Let R=3
=>2x3=6(T=6) & 2x1.5=3(S=1.5)
=>T=6 & S=1.5. In this case, S<T

Case 2: Let R=-4
=>2x-4=-8(T=-8) & 2x-2=-4(S=-2)
=>T=-8 & S=-2. In this case. S>T

Hence C is also insufficient.

Answer is E

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Re: Is S < T? (1) R = T/2 (2) S = R/2  [#permalink]

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New post 23 Sep 2018, 03:03

Solution



To find:
    • Whether S < T

Analysing Statement 1
As per the information given in statement 1, \(R = \frac{T}{2}\)

    • We don’t have any relevant information about S.

Hence, statement 1 is not sufficient.

Analysing Statement 2
As per the information given in statement 2, \(S = \frac{R}{2}\)

    • We don’t have any relevant information about T.

Hence, statement 2 is not sufficient.

Combining Both Statements
We know \(R = \frac{T}{2}\) and \(S = \frac{R}{2}\).
Hence, we can say \(S = \frac{T}{4}\), or, \(T = 4S\).

    • Now, if both S and T are positive integers, then T > S.
    • Whereas if both S and T are negative integers, then T < S.

As we can see, we can have multiple possibilities.

Hence, the correct answer is option E.

Answer: E
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Re: Is S < T? (1) R = T/2 (2) S = R/2  [#permalink]

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New post 24 Sep 2018, 05:19
Harshgmat wrote:
Is \(S < T\)?

(1) \(R = T/2\)

(2) \(S = R/2\)


Statement 1 and 2 are clearly insufficient. We don't have any relevant info regarding S.

Combining 1 and 2:
T=4S
S=2 T=8
S<T
S=-3 and T=-12
S>T
Insufficient
E
GMAT Club Bot
Re: Is S < T? (1) R = T/2 (2) S = R/2   [#permalink] 24 Sep 2018, 05:19
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