This is a great question and the key to answering this question is to understand the data given in the premise.
60% of eligible voters voted -> this means that, of all of the people who were registered / allowed to vote, 60% of them voted.
The 71% refers to people who answered the poll,so we are talking about two different groups here. The poll surveyed some particular set of people , some of whom voted and some of whom did not vote. Some of the people polled may not even have been eligible
...
60% of eligible voters voted -> this means that, of all of the people who were registered / allowed to vote, 60% of them voted.
The 71% refers to people who answered the poll,so we are talking about two different groups here. The poll surveyed some particular set of people , some of whom voted and some of whom did not vote. Some of the people polled may not even have been eligible
...


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