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# Which of the following could be b if |5b – 7| < 1?

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Which of the following could be b if |5b – 7| < 1?  [#permalink]

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19 Dec 2016, 04:33
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80% (01:12) correct 20% (01:07) wrong based on 402 sessions

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Which of the following could be b if |5b – 7| < 1?

A. -7/5
B. 3/2
C. 8/5
D. 2
E. 0

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Re: Which of the following could be b if |5b – 7| < 1?  [#permalink]

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19 Dec 2016, 08:23
Bunuel wrote:
Which of the following could be b if |5b – 7| < 1?

A. -7/5
B. 3/2
C. 8/5
D. 2
E. 0

Plug in the values and check a 10 sec solution..

Only (B) holds true...

$$|5b – 7| < 1$$

Or, $$|5*\frac{3}{2} – 7| < 1$$

Or, $$|\frac{15}{2} – 7| < 1$$

Or, $$|7.5 – 7| < 1$$

Or, $$| 0.5 | < 1$$

Hence, correct answer will be (B)

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Re: Which of the following could be b if |5b – 7| < 1?  [#permalink]

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19 Dec 2016, 13:22
mod(5b-7) <1
=>-1<5b-7<1
=>6<5b<8
=>1.2<b<1.6

Ans is (B) which is 1.5
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Re: Which of the following could be b if |5b – 7| < 1?  [#permalink]

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03 Jan 2017, 16:17
Bunuel wrote:
Which of the following could be b if |5b – 7| < 1?

A. -7/5
B. 3/2
C. 8/5
D. 2
E. 0

We will consider 2 separate cases: when (5b - 7) is positive and when (5b - 7) is negative.

Case 1: (5b - 7) is positive:

5b - 7 < 1

5b < 8

b < 8/5

Case 2: (5b - 7) is negative:

-(5b - 7) < 1

-5b + 7 < 1

-5b < -6

b > 6/5

Thus, 6/5 < b < 8/5, or 1.2 < b < 1.6. Since 3/2 = 1.5, b could be 3/2.

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Re: Which of the following could be b if |5b – 7| < 1?  [#permalink]

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12 Nov 2017, 10:25
|5b -7| < 1
-1 < (5b-7) < 1 ; add +7
6 < 5b < 8 ; divide by 5
6/5 < b < 8/5

No need to compute anything, B must be the answer.
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Re: Which of the following could be b if |5b – 7| < 1?  [#permalink]

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09 Mar 2018, 04:45
Bunuel wrote:
Which of the following could be b if |5b – 7| < 1?

A. -7/5
B. 3/2
C. 8/5
D. 2
E. 0

Using POE:

We can easily eliminate the choices A, D, and E as they will always yield value more than 1.

C. 8/5

|5*8/5 – 7| < 1 & 1 = 1 eliminate

Hence (B)
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Re: Which of the following could be b if |5b – 7| < 1? &nbs [#permalink] 09 Mar 2018, 04:45
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# Which of the following could be b if |5b – 7| < 1?

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