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If |20 − x| = 12, what is the sum of the two possible value of x?

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If |20 − x| = 12, what is the sum of the two possible value of x?  [#permalink]

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New post 16 Apr 2018, 04:39
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

84% (00:44) correct 16% (00:49) wrong based on 143 sessions

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Re: If |20 − x| = 12, what is the sum of the two possible value of x?  [#permalink]

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New post 16 Apr 2018, 04:50
1
Bunuel wrote:
If |20 − x| = 12, what is the sum of the two possible value of x?

A. 8
B. 16
C. 24
D. 32
E. 40


X1=8, X2=32.
X1+X2=40.
Hence, E.
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Re: If |20 − x| = 12, what is the sum of the two possible value of x?  [#permalink]

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New post 16 Apr 2018, 07:27
1
Bunuel wrote:
If |20 − x| = 12, what is the sum of the two possible value of x?

A. 8
B. 16
C. 24
D. 32
E. 40


case 1 : 20-x=12
x=8

case 2: -(20-x)=12
-20+x=12
x=32

So the sum of the 2 possible values of x is (32+8)=40, which is option E.
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Re: If |20 − x| = 12, what is the sum of the two possible value of x?  [#permalink]

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New post 17 Apr 2018, 15:18
Bunuel wrote:
If |20 − x| = 12, what is the sum of the two possible value of x?

A. 8
B. 16
C. 24
D. 32
E. 40


Solving for x when (20 - x) is positive, we have:

20 - x = 12

8 = x

Solving for x when (20 - x) is negative, we have:

-(20 - x) = 12

-20 + x = 12

x = 32

The sum is 8 + 32 = 40.

Answer: E
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Re: If |20 − x| = 12, what is the sum of the two possible value of x?  [#permalink]

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New post 17 Apr 2018, 16:06
If |20 − x| = 12, what is the sum of the two possible value of x?

Concept |x-a| = distance of x from a
Now |20 − x| = 12, it means x is at a distance of 12 from 20,
Hence x is either 8 or 32
Sum = 8+32 =40. (E)
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Re: If |20 − x| = 12, what is the sum of the two possible value of x? &nbs [#permalink] 17 Apr 2018, 16:06
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If |20 − x| = 12, what is the sum of the two possible value of x?

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