GRE Math Challenge: What fraction registered voters that did not vote in the last election?
In a recent survey, 80% of the people polled were registered voters and 75% of the registered voters voted in the last election. What fraction of all those surveyed were registered voters that did not vote in the last election?
A) 1/10
B)1/5
C)1/4
D) 3/10
E)1/3
Explanation:
Correct Choice: (B)
This question asks you to pick numbers, which will make the math a whole lot easier.
Say 100 people were polled.
Then 80%, or 80 of them were registered voters.
75% of these, or 3/4 , voted in the last election, so 1/4 of them did not vote in the last election.
1/4 of 80 is 20, so 20 of the 100 people polled were registered voters who did not vote in the last election. As a fraction, 20 divided by 100 is 1/5.
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