In an election, candidate Smith won 52 percent of the total vote in Co

Question

In an election, candidate Smith won 52 percent of the total vote in Counties A and B. He won 61 percent of the vote in County A. If the ratio of people who voted in County A to County B is 3: 1, what percent of the vote did candidate Smith win in County B?

A. 25%
B. 27%
C. 34%
D. 43%
E. 49%

A. 25%
B. 27%
C. 34%
D. 43%
E. 49%

saanjaaygupta · Accepted Answer

(61%)*3x + (y%)*x = (52%)*4x y = 25% hence answer is A.

EvaJager · Answer

Use the property of weighted averages: at-a-certain-company-average-arithmetic-mean-number-of-137851.html#p1115917 b - percent of the vote that candidate Smith win in County B In our case: \frac{A}{B}=\frac{3}{1}=\frac{52-b}{61-52} , from which b = 25%. Answer A.

unceldolan · Answer

A : B : Total
3 : 1 : 4

Say there are a total of 100 votes. 100/4 = 25. Three parts of the 100 are in country A. So 75. Rest is in country B. Thus 25, A.

Wasn't quite sure, so this was an elevated guess, does this work? Or was it luck? :D

OptimusPrepJanielle · Answer

Let total votes in County A = 3x. Let total votes in County B = x. Hence total votes in Count A & B together = 4x Given that, 0.52(4x) = 0.61(3x) + n(x) So, 2.08x = 1.83x + nx So, n = 0.25 = 25% Hence option A -- Optimus Prep's GMAT On Demand course for only $299 covers all verbal and quant. concepts in detail. Visit the following link to get your 7 days free trial account: https://www.optimus-prep.com/gmat-on-demand-course

EMPOWERgmatRichC · Answer

Hi All,

The answer selected by this user IGNORES the percents that we're meant to use, and it's essentially just 'dumb luck' that the user got the question correct.

Here's how you can TEST VALUES to get to the correct answer.

Since we have 3 times as many voters in Country A as in Country B, let's start there....

Country A = 300 voters
Country B = 100 voters

We're told that the candidate won 61% of the votes in A and 52% of the votes in TOTAL. We're asked for the percent of votes that the candidate won in Country B. From this information, we can set up the following equation...

/400 = .52

183 + 100X = 208
100X = 25
X = 25/100 = 25%

Final Answer:  A

As a side note, the Official GMAT tends to design questions that won't allow for this type of 'coincidence' to be the correct answer.

GMAT assassins aren't born, they're made,
Rich

EMPOWERgmatRichC · Answer

Hi All,

This question can be solved by TESTing VALUES.

We're given a series of facts to work with:
1) In an election, candidate Smith won 52 percent of the total vote in Counties A and B. 
2) He won 61 percent of the vote in County A. 
3) The ratio of people who voted in County A to County B is 3:1

We're asked for the PERCENT of the vote that he won in County B.

Let's TEST VALUES....

Since the ratio of the people who voted is 3:1, let's TEST...
300 people voted in County A
100 people voted in County B

He won 52% of the TOTAL vote...
(.52)(400) = 208 votes

He won 61% of County A....
(.61)(300) = 183 votes

208 - 183 = 25 votes won in County B (out of the 100 votes that were cast).

Final Answer:  A

GMAT assassins aren't born, they're made,
Rich

chetan2u · Answer

Another way to do these type of Q, which involve AVERAGES is WEIGHTED average method or Allegation..

A:B = 3:1 ...
A = 61% and AVG = 52%..
so  B = 52 - \frac{3}{1}( 61-52) ..
 => 52-3*9 = 52-27 = 25% 
A

generis · Answer

\frac{A}{B}=\frac{3}{1}

I just used those numbers, as you would in a mixture problem.

Let A = 3
Let B = 1
Resultant percentage = .52(A + B) = .52(4)
Let x = percent of vote won in B

.61(3) + x(1) = .52(4)
1.83 + x = 2.08
x = 2.08 - 1.83
x = .25 * 100 = 25 percent

Answer A

testcracker · Answer

hi lets think this way the voters, the weights, in country A and B are in the ratio of 3 : 1 now, set the weighted average equation 61 * 3 + 1 * b ____________ = 52 4 solving for b, we get the desired result: 25% thanks cheers through the kudos button if this helps you anyway

JeffTargetTestPrep · Answer

We can let the number of votes cast in County B = x and thus the number of votes cast in County A = 3x. We can create the following equation where p = percent of vote candidate Smith won in County B:

0.61(3x) + (p/100)x = .52(3x + x)

61(3x) + px = 52(4x)

183x + px = 208x

183 + p = 208

p = 25

Answer: A

Helium · Answer

To find the percent of votes won in County B, we need to recognize that the total votes won is the sum of the votes in the 2 counties and that the number of votes won in each county is the percentage won multiplied by the number of voters. If we let x% be the percent won in County B, we can write this equation: (61% of County A voters) + (x% of County B voters) = 52% of all voters, or 0.61(County A voters) + (x/100) (County B voters) = 0.52(all voters).

We don't know the number of voters, but we do know that the ratio of County A voters to County B voters is 3:1. Thus, 3/4 of the voters are in County A and 1/4 are in County B. Now suppose that V is the total number of voters, meaning that we have V voters in County A and V voters in County B. So, our original equation becomes 0.61*(3/4) v + (x/100) (1/4) v = 0.52v.

Notice that V appears in each term, so it can be cancelled out. In other words, since we know the proportion of voters in each county, we don't need to know the actual number of voters. In fact, we can simply think of the overall percentage won, 52%, as the weighted average of the percentages won in each county, where the weights are each county's fraction of the total voters.

To solve for x, let's get rid of the fractions by multiplying both sides by 400. This gives us 0.61(300) + x = 208, 183 + x = 208, or x = 208 - 183 = 25. The percent of the voters voting for candidate Smith was 25%. Choice (A) is correct.

ScottTargetTestPrep · Answer

We can create the equation:

0.61A + nB = 0.52(A + B)

0.61A + nB = 0.52A + 0.52B

0.09A = 0.52B - nB

and

A/B = 3/1

A = 3B

Substituting, we have:

0.09(3B) = 0.52B - nB

0.27B = 0.52B - nB

nB = 0.25B

n = 0.25 = 25%

Alternate Solution:

Let’s assume that 400 people voted. This means that 300 were in County A and 100 were in County B.

Smith won 52% of the 400 votes, which is 400 x 0.52 = 208 total votes.
He also won 61% of the vote in County A, which is 300 x 0.61 = 183 votes.

This means that his County B vote total is 208 - 183 = 25, which is 25% of the 100 votes cast in County B.

Answer: A

TarPhi · Answer

Easy.

3*61 + x*1 = 52*4
Hence x=25

Answer is A

MathRevolution · Answer

Let us assume that the number of people in County A = Country B = 1000.

Voters ratio A: B = 3: 1  : Total votes: 300 + 100 = 400

Smith won 52% of total votes of A and B:  \frac{52 }{100} * 400 = 208

Smith won 61% of total votes of A:  \frac{61 }{100} * 300 = 183

=> 208 - 183 = 25

Percent of county B win:  \frac{25}{100} * 100 = 25%

Answer A

Basshead · Answer

The way I answer these types of questions is by thinking logically.

We're told in an election, candidate Smith won 52 percent of the total vote in Counties A & B. He won 61 percent of the vote in County A.

Lets think for a second: if the ratio of people who votes in County A to B is 1:1, what percent of the vote did candidate Smith win in County B? Since 61% is 9% away from 52, he would have won 43% in County B.

If the ratio of people who votes in County A to B is 2:1, what percent of the vote did candidate Smith win in County B? Since 61% is 9% away from 52, we have to double this percent and subtract that number from 52. He would have won 34% in County B.

Now, what if the ratio of people who voted in County A to County B is 3:1? We have to triple the 9% and subtract that percent from 52:  he would have won 25% in County B .

Answer is A.

Prakruti_Patil · Answer

Hey, but to get 52 we have subtracted from 61 in alligations.. then aren't we supposed to add to 52 for the number for country B? how do we know we need to subtract from both?

In an election, candidate Smith won 52 percent of the total vote in Co

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