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In a election 40% voted for Person A, whereas 45% voted for Person B. The remaining people were not vote to any person. If the difference between those who vote for Person B in the election and those who are uncertain was 640, how many people are participated in the election?

2500
2400
2100
2800
Explanation:
Let the number of individuals involved in election be x. Percentage of those who were not vote = 100-(40+45) = 15% The difference between those who voted 45% of x – 15% of x = 630 30% of x = 630 x=630*100/30 =2100.
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