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# For all numbers a and b, if the operation \$ is defined by a\$b = ab/2

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Math Expert
Joined: 02 Sep 2009
Posts: 58335
For all numbers a and b, if the operation \$ is defined by a\$b = ab/2  [#permalink]

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21 Jan 2019, 03:33
00:00

Difficulty:

15% (low)

Question Stats:

94% (00:32) correct 6% (01:05) wrong based on 21 sessions

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For all numbers a and b, if the operation \$ is defined by a\$b = ab/2, then 3\$(5\$8) =

A 10
B 20
C 30
D 40
E 60

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Joined: 31 Oct 2013
Posts: 1475
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: For all numbers a and b, if the operation \$ is defined by a\$b = ab/2  [#permalink]

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21 Jan 2019, 04:13
Bunuel wrote:
For all numbers a and b, if the operation \$ is defined by a\$b = ab/2, then 3\$(5\$8) =

A 10
B 20
C 30
D 40
E 60

Function: a\$b = ab/2.

Given,

3\$(5\$8)

5\$8 = 5*8/2 = 20.

3\$20 = 3*20 / 2 = 30.

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Joined: 18 Aug 2017
Posts: 4976
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
Re: For all numbers a and b, if the operation \$ is defined by a\$b = ab/2  [#permalink]

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21 Jan 2019, 09:49
Bunuel wrote:
For all numbers a and b, if the operation \$ is defined by a\$b = ab/2, then 3\$(5\$8) =

A 10
B 20
C 30
D 40
E 60

solve with given function relation
we get
a\$b = 30
IMO C
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Joined: 09 Mar 2018
Posts: 997
Location: India
Re: For all numbers a and b, if the operation \$ is defined by a\$b = ab/2  [#permalink]

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21 Jan 2019, 10:49
Bunuel wrote:
For all numbers a and b, if the operation \$ is defined by a\$b = ab/2, then 3\$(5\$8) =

A 10
B 20
C 30
D 40
E 60

IMO C

Given a\$b = ab/2

3\$(5\$8) =?

5\$8 = 40/2 = 20

3\$(20) = 60/2 =30
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Re: For all numbers a and b, if the operation \$ is defined by a\$b = ab/2   [#permalink] 21 Jan 2019, 10:49
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