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In Linguistics $101,$ the ratio of the number of juniors to the number of seniors is $3:2$.  When twelve more juniors join the class, and one senior drops the class, the ratio of the number of juniors to the number of seniors becomes $2:1$.  How many students are in the class after these changes?

 Aug 21, 2024
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x = ORIGINAL number of students            3/5 are juniors     2/5 are seniors

then add 12 juniors and subtract 1 senior to get : 

 

(3/5 x + 12 ) / (2/5 x -1)  = 2/1             cross multiply and solve for x = original # of students = 70 

 

after adding 11 more = 81 students 

 Aug 21, 2024

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