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# If (1 – 1.25)N = 1, then N =

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Math Expert
Joined: 02 Sep 2009
Posts: 58427
If (1 – 1.25)N = 1, then N =  [#permalink]

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14 Oct 2015, 21:28
3
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00:00

Difficulty:

5% (low)

Question Stats:

85% (00:34) correct 15% (00:34) wrong based on 1300 sessions

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If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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14 Oct 2015, 21:30
3
n=1/-0.25, so n=-4

Ans: c
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Posts: 4018
Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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14 Oct 2015, 21:42
3
Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

(1 – 1.25)N = 1
Simplify to get: -0.25N = 1
Rewrite as (-1/4)N = 1
Multiply both sides by -4 to get: N = -4

Cheers,
Brent
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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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26 Apr 2016, 14:11
Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

$$(1 – 1.25)N = 1$$ --> $$(-0.25)N = 1$$ --> $$N = \frac{1}{-0.25}$$ --> $$N = \frac{1}{-1/4}$$ --> $$N = -4$$
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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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28 Apr 2016, 07:02
Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

We need to determine the value of N in the equation (1 – 1.25)N = 1.

(1 – 1.25)N = 1

(-0.25)N = 1

(-1/4)N = 1

N = -4

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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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28 Apr 2016, 11:29
Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

(1 – 1.25)N = 1

Or ($$1$$ – $$\frac{5}{4}$$)N = $$1$$

Or $$\frac{-1}{4}$$N = $$1$$

So, N = - 4

Hence answer will definitely be (C)
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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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23 Jun 2016, 03:01
Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

$$1 -$$ $$\frac{125}{100}$$ $$*N$$ = 1

$$-$$$$\frac{25}{100}$$ $$*N$$ = 1

$$N =$$ $$-$$$$\frac{100}{25}$$
$$N =$$ $$- 4$$
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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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09 Apr 2017, 09:54
1-1.25 = -.25
n/-4 = 1
cross multiply and you get n = -4
C
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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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10 Jun 2018, 11:39
Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

As we are deducting 1.25 from 1, ultimate result will be negative. Eliminate D and E. -0..25 is equivalent to 1/4. so ultimate result will be -4.

Thus the best answer is Option C.
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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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23 Jun 2019, 06:26
Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

In this case we have 1-(1.25 is 5/4), so that's going to be -1/4.

the correct answer choice is C.
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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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15 Sep 2019, 05:33
Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

-.25N=1
N=-4

IMO C

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Re: If (1 – 1.25)N = 1, then N =   [#permalink] 15 Sep 2019, 05:33
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