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If the result obtained by multiplying a number, x, by a number 1 less

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If the result obtained by multiplying a number, x, by a number 1 less  [#permalink]

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New post 06 Feb 2018, 22:48
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

89% (01:08) correct 11% (01:30) wrong based on 74 sessions

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Re: If the result obtained by multiplying a number, x, by a number 1 less  [#permalink]

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New post 06 Feb 2018, 22:59
Bunuel wrote:
If the result obtained by multiplying a number, x, by a number 1 less than itself is 4 less than multiplying x by itself, then x =

(A) 1

(B) 2

(C) 3

(D) 4

(E) 5


Translating the question in the form of equations we will get
\(x(x-1) = x^2 - 4\)
\(x^2 - x = x^2 - 4\)
\(-x = -4\)

Therefore, x = 4(Option D)

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Re: If the result obtained by multiplying a number, x, by a number 1 less  [#permalink]

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New post 09 Feb 2018, 11:02
Bunuel wrote:
If the result obtained by multiplying a number, x, by a number 1 less than itself is 4 less than multiplying x by itself, then x =

(A) 1

(B) 2

(C) 3

(D) 4

(E) 5


x(x - 1) = x^2 - 4

x^2 - x = x^2 - 4

-x = -4

x = 4

Answer: D
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Re: If the result obtained by multiplying a number, x, by a number 1 less  [#permalink]

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New post 11 Feb 2018, 21:46
x*(x - 1) = x^2 - 4
x^2 - x = x^2 - 4
- x = - 4
x = 4 (Option D)
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Re: If the result obtained by multiplying a number, x, by a number 1 less  [#permalink]

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New post 13 Feb 2018, 03:00
I think wording of this problem is a bit ambiguous.

If the result obtained by multiplying a number, x, by a number 1 less than itself is 4 less than multiplying x by itself, then x =

It sounds x is multiplied by some other number which is 1 less than itself. i.e x*(y-1).

It would be clearer if it said: "If the result obtained by multiplying a number, x, by 1 less than itself is 4 less than multiplying x by itself, then x...."
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Re: If the result obtained by multiplying a number, x, by a number 1 less  [#permalink]

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New post 24 Feb 2018, 22:45
from given data equation is
x(x-1)= x*2-4
solving
x*2-x=x*2-4
x=4
option D
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Re: If the result obtained by multiplying a number, x, by a number 1 less   [#permalink] 24 Feb 2018, 22:45
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