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

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Math Expert
Joined: 02 Sep 2009
Posts: 51235
If the result obtained by multiplying a number, x, by a number 1 less  [#permalink]

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06 Feb 2018, 21:48
00:00

Difficulty:

5% (low)

Question Stats:

88% (01:10) correct 12% (01:30) wrong based on 74 sessions

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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

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Posts: 3327
Location: India
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Re: If the result obtained by multiplying a number, x, by a number 1 less  [#permalink]

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06 Feb 2018, 21:59
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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09 Feb 2018, 10:02
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

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Joined: 28 Dec 2017
Posts: 31
Re: If the result obtained by multiplying a number, x, by a number 1 less  [#permalink]

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11 Feb 2018, 20:46
x*(x - 1) = x^2 - 4
x^2 - x = x^2 - 4
- x = - 4
x = 4 (Option D)
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Posts: 123
Re: If the result obtained by multiplying a number, x, by a number 1 less  [#permalink]

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13 Feb 2018, 02:00
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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Joined: 21 Nov 2017
Posts: 6
Re: If the result obtained by multiplying a number, x, by a number 1 less  [#permalink]

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24 Feb 2018, 21:45
from given data equation is
x(x-1)= x*2-4
solving
x*2-x=x*2-4
x=4
option D
Re: If the result obtained by multiplying a number, x, by a number 1 less &nbs [#permalink] 24 Feb 2018, 21:45
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