MHB Solve Ratio Problem: Jackson's Votes in Mayor Election Explained

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In the mayoral election, Jackson received 30% of the total votes, amounting to 3,696 votes. The remaining votes, totaling 8,624, were split between Morris and Victor, with Morris receiving 3,234 votes and Victor 5,390 votes. The combined total of votes for Jackson and Morris is 6,930, from which Jackson secured 8/15. Consequently, Morris received the remaining fraction of the combined votes. The discussion highlights the distribution of votes among the three candidates and the specific ratios involved.
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Here's the question: Last year there were three candidates who ran for mayor, Morris, Jackson, and Victor. Out of a total of 12,320 votes, Jackson received 30% of the votes. If for ever 3 votes for Morris there were 5 votes for Victor, how many votes for Jackson were there for every 7 votes for Morris?
 
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Jackson got 30% of the votes, which is 3,696 votes. This means that together, Morris and Victor got the remaining 70%, which is 8,624 votes. Morris got 3/8 of these (3,234 votes), while Victor got 5/8 (5,390) votes.

Now, the combined votes for Jackson and Morris is 6,930. Jackson got 8/15 of these votes, so what fraction did Morris get?
 

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