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# Let # be defined for all numbers a, b, c, and d by

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GMAT Club team member
Status: GMAT Club Team Member
Affiliations: GMAT Club
Joined: 02 Nov 2016
Posts: 5915
GPA: 3.62
Let # be defined for all numbers a, b, c, and d by  [#permalink]

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05 Mar 2020, 06:58
1
00:00

Difficulty:

15% (low)

Question Stats:

91% (00:55) correct 9% (01:54) wrong based on 23 sessions

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Attachment:

123.jpg [ 34.97 KiB | Viewed 345 times ]

(A) 1
(B) 2
(C) 18
(D) 38
(E) 178

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Intern
Joined: 24 Dec 2019
Posts: 1
Re: Let # be defined for all numbers a, b, c, and d by  [#permalink]

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06 Mar 2020, 03:04
x=5*2-4*1 = 6
Substituting for x:
6*2-10*1 = 2

So Answer = 2 = B
Intern
Joined: 03 Jan 2020
Posts: 40
Re: Let # be defined for all numbers a, b, c, and d by  [#permalink]

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12 Mar 2020, 00:52
Here based on the function defined
x can be calculated as
x= (5x2)-(4x1) = 6
Now replacing x i the value needed we get
(6x2)-(10x1) = 2

Target Test Prep Representative
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Re: Let # be defined for all numbers a, b, c, and d by  [#permalink]

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15 Mar 2020, 03:58
Attachment:
123.jpg

(A) 1
(B) 2
(C) 18
(D) 38
(E) 178

x = 5*2 - 4*1 = 10 - 4 = 6

So, the value of the second symbol is:

6*2 - 10*1 = 12 - 10 = 2

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Re: Let # be defined for all numbers a, b, c, and d by   [#permalink] 15 Mar 2020, 03:58