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(1 - 1.25)N = 1

This topic has 3 expert replies and 0 member replies
boomgoesthegmat Senior | Next Rank: 100 Posts Default Avatar
Joined
25 Apr 2016
Posted:
93 messages
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(1 - 1.25)N = 1

Post Thu Apr 28, 2016 1:37 pm
If (1 - 1.25)N = 1, then N =
A) -400
B) -140
C) -4
D) 4
E) 400

C

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Post Wed Dec 13, 2017 12:53 pm
boomgoesthegmat wrote:
If (1 - 1.25)N = 1, then N =
A) -400
B) -140
C) -4
D) 4
E) 400
We can simplify the given equation:

(1 - 1.25)N = 1

-0.25N = 1

N = 1/(-0.25)

N = -4

Answer: C

_________________

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GMAT Quant Self-Study Course - 500+ lessons 3000+ practice problems 800+ HD solutions
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Post Thu Apr 28, 2016 2:22 pm
boomgoesthegmat wrote:
If (1 - 1.25)N = 1, then N =
A) -400
B) -140
C) -4
D) 4
E) 400
Matt's solution makes more sense, but here's another approach (for kicks):
Given: (1 - 1.25)N = 1
Divide both sides by N to get: 1 - 1.25 = 1/N
Evaluate: -0.25 = 1/N
Rewrite as fraction: -1/4 = 1/N
Orrrrr: 1/(-4) = 1/N
So, N must equal -4

Answer: C

Cheers,
Brent

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Post Wed Dec 13, 2017 12:53 pm
boomgoesthegmat wrote:
If (1 - 1.25)N = 1, then N =
A) -400
B) -140
C) -4
D) 4
E) 400
We can simplify the given equation:

(1 - 1.25)N = 1

-0.25N = 1

N = 1/(-0.25)

N = -4

Answer: C

_________________

Scott Woodbury Stewart Founder & CEO
GMAT Quant Self-Study Course - 500+ lessons 3000+ practice problems 800+ HD solutions
5-Day Free Trial 5-DAY FREE, FULL-ACCESS TRIAL TTP QUANT

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