25 of the voters promise to vote for P and the rest promised to vote for Q. Of these, on the last day 15% of the voters went back of their promise to vote for P and 25% of voters went back of their promise to vote for Q, and P lost by 2 votes. Then the total number of voters is
Explanation:
Let there be 100 voters in all. Initially, 40 of these promised to vote for P, while 60 of them promised to vote for Q. On the last day, (15% of 40) = 6 voters went back of their promise and voted for Q. Also, 25% of 60 = 15 voters shifted their interest from Q to P. So finally, P end up getting (40 – 6 + 15) = 49 votes and Q end up getting (60 – 15 + 6) = 51 votes. Hence, margin of victory for Q = (51 – 49) = 2, which is true. Hence, there were 100 voters in all.
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