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# If a#b = ab – b + b^2, then 3#5 =

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Math Expert
Joined: 02 Sep 2009
Posts: 60778
If a#b = ab – b + b^2, then 3#5 =  [#permalink]

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15 Jul 2015, 03:23
00:00

Difficulty:

5% (low)

Question Stats:

96% (00:27) correct 4% (00:09) wrong based on 108 sessions

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If a#b = ab – b + b^2, then 3#5 =

A. 2
B. 8
C. 15
D. 21
E. 35

Kudos for a correct solution.

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Joined: 26 Dec 2011
Posts: 115
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Re: If a#b = ab – b + b^2, then 3#5 =  [#permalink]

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15 Jul 2015, 04:37
1
Bunuel wrote:
If a#b = ab – b + b^2, then 3#5 =

A. 2
B. 8
C. 15
D. 21
E. 35

Kudos for a correct solution.

Solution -
Simply substitute 3 and 5 in equation in the place of a and b respectively.

3#5 = 3*5 - 5 + 5^2 = 15 - 5 + 25 = 35. ANS E
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Re: If a#b = ab – b + b^2, then 3#5 =  [#permalink]

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15 Jul 2015, 06:03
1
a#b = ab – b + b^2
3#5 = 15 - 5 + 5^2 = 35. Ans (E).
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Re: If a#b = ab – b + b^2, then 3#5 =  [#permalink]

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15 Jul 2015, 14:15
1

3(5)-5+5^2.

I think this question is sub-600 even though I hope its not because it was easy for me.
Intern
Joined: 11 Sep 2013
Posts: 7
Re: If a#b = ab – b + b^2, then 3#5 =  [#permalink]

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15 Jul 2015, 22:34
1
3#5= 3(5)-5+(5)^2 = 15-5+25= 35
Option E
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Re: If a#b = ab – b + b^2, then 3#5 =  [#permalink]

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15 Jul 2015, 04:38
Bunuel wrote:
If a#b = ab – b + b^2, then 3#5 =

A. 2
B. 8
C. 15
D. 21
E. 35

Kudos for a correct solution.

a#b = ab – b + b^2

Replace a=3 and b = 5

3#5 = 3*5 – 5 + 5^2 = 15 - 5 + 25 = 35

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Re: If a#b = ab – b + b^2, then 3#5 =  [#permalink]

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15 Jul 2015, 20:47
Bunuel wrote:
If a#b = ab – b + b^2, then 3#5 =

A. 2
B. 8
C. 15
D. 21
E. 35

Kudos for a correct solution.

a#b = ab – b + b^2
3#5 = (3)(5)-5+5^2 = 15-5+25 = 35

E
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Joined: 20 Jul 2011
Posts: 78
GMAT 1: 660 Q49 V31
Re: If a#b = ab – b + b^2, then 3#5 =  [#permalink]

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17 Jul 2015, 16:40
Bunuel wrote:
If a#b = ab – b + b^2, then 3#5 =

A. 2
B. 8
C. 15
D. 21
E. 35

Kudos for a correct solution.

3#5 = 15-5+25 => 35

Option E
Math Expert
Joined: 02 Sep 2009
Posts: 60778
Re: If a#b = ab – b + b^2, then 3#5 =  [#permalink]

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19 Jul 2015, 13:07
Bunuel wrote:
If a#b = ab – b + b^2, then 3#5 =

A. 2
B. 8
C. 15
D. 21
E. 35

Kudos for a correct solution.

800score Official Solution:

On test day, the # symbol or any other such symbol in a question will represent a function.

In this case, a#b = ab – b + b^2 is a function. Simply substitute a = 3 and b = 5 into the formula and calculate:
3#5 = 3(5) – 5 + 5^2 = 15 – 5 + 25 = 35.

The correct answer is choice (E).
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Re: If a#b = ab – b + b^2, then 3#5 =   [#permalink] 19 Jul 2015, 13:07
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