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If Kelly received 1/3 more votes than Mike in a student

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If Kelly received 1/3 more votes than Mike in a student [#permalink]

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New post 18 May 2011, 13:08
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If Kelly received 1/3 more votes than Mike in a student election, which of the following could have been the total number of votes cast for the two candidates?

A. 12
B. 13
C. 14
D. 15
E. 16
[Reveal] Spoiler: OA
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Re: From MitDavidDv: Problem Solving Question [#permalink]

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New post 18 May 2011, 13:25
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MitDavidDv wrote:
If Kelly received 1/3 more votes than Mike in a student election, which of the following could have been the total number of votes cast for the two candidates?
A. 12
B. 13
C. 14
D. 15
E. 16


Question should say: 1/3 TIMES more votes.

K = M + 1/3M
K = (4/3)M
M+K=M+(4/3)M=Total
Total = (7/3)M
M=(3/7)Total

Total must be a multiple of 7 because Mary can't receive fractional numbers of votes.

Only option that is a multiple of 7 is 14.

Ans: "C"
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Re: From MitDavidDv: Problem Solving Question [#permalink]

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New post 18 May 2011, 18:28
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K = (4/3)M

=> M+K = (7/3)*M

=> M = (3/7)*(M+K)

M+K has to be a multiple of 7.

Only possible option here is 14.

Answer is C.
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Re: From MitDavidDv: Problem Solving Question [#permalink]

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New post 18 May 2011, 19:37
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MitDavidDv wrote:
If Kelly received 1/3 more votes than Mike in a student election, which of the following could have been the total number of votes cast for the two candidates?
A. 12
B. 13
C. 14
D. 15
E. 16


You can use ratios to solve it too.
Kelly received 1/3 more votes than Mike which means that if Mike got 3 votes, Kelly got 4 votes (1/3 more than Mike). Since votes cannot be fractional, Mike must have got at least 3 votes and Kelly must have got at least 4 votes. They must have got at least 7 votes together. Actual number of votes could be any multiple of 7. The only multiple of 7 in the options is 14.
For more on ratios, check:
http://www.veritasprep.com/blog/2011/03 ... of-ratios/
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Re: From MitDavidDv: Problem Solving Question [#permalink]

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New post 18 May 2011, 21:28
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7/3 * M = total votes

means total votes/7 = integer.

14 fits
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Re: From MitDavidDv: Problem Solving Question [#permalink]

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New post 03 Nov 2012, 08:22
It's not clear to whether 1/3 has to be applied to the votes cast to Mike or to the total votes
Please help
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Re: From MitDavidDv: Problem Solving Question [#permalink]

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New post 03 Nov 2012, 21:37
Ousmane wrote:
It's not clear to whether 1/3 has to be applied to the votes cast to Mike or to the total votes
Please help


The question clearly says "Kelly received 1/3 more votes than Mike"
The comparison of 1/3rd more is with Mike.

So for every 3 votes, Kelly received 1 extra vote i.e. she received 4 votes.
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Re: If Kelly received 1/3 more votes than Mike in a student [#permalink]

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New post 06 Nov 2012, 15:48
K = 4/3 M
we know M has to be a multiple of 3 in order to get an integer for K + M

plug in a couple values for M:

M = 3 => K = 3 + 1 = 4
M + K = 7 (not in choices)

M = 6 => K = 6 + 2 = 8
M + K = 14 (answer C)
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Re: If Kelly received 1/3 more votes than Mike in a student [#permalink]

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Re: If Kelly received 1/3 more votes than Mike in a student [#permalink]

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New post 13 Jan 2015, 22:27
Let votes to Mike = x

Then votes to Kelly \(= x + \frac{x}{3}\)

Total votes \(= 2x + \frac{x}{3} = \frac{7x}{3}\)

\(x = (Total Votes) * \frac{3}{7}\)

Total votes should be divisible by 7, only 14 fits in

Answer = C
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Re: If Kelly received 1/3 more votes than Mike in a student [#permalink]

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Re: If Kelly received 1/3 more votes than Mike in a student [#permalink]

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New post 01 May 2017, 20:27
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Re: If Kelly received 1/3 more votes than Mike in a student [#permalink]

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New post 10 May 2017, 12:33
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MitDavidDv wrote:
If Kelly received 1/3 more votes than Mike in a student election, which of the following could have been the total number of votes cast for the two candidates?

A. 12
B. 13
C. 14
D. 15
E. 16


If we let k = the number of votes Mike received, then (4/3)k = the number of votes Kelly received. Thus, they received a total of k + 4k/3 = 3k/3 + 4k/3 = 7k/3 votes.

Since 7k/3 has to be an integer, k can be any multiple of 3.

When k is 3, the total number of votes is 7(3)/3 = 7.

When k is 6, the total number of votes is 7(6)/3 = 14.

Answer: C
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Re: If Kelly received 1/3 more votes than Mike in a student [#permalink]

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New post 19 May 2017, 12:33
Let votes to Mike = x
Total votes =2x+x/3=7x/3= hence answer should be multiple of 7 thats 14 - option C
Answer = C
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Re: If Kelly received 1/3 more votes than Mike in a student   [#permalink] 19 May 2017, 12:33
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