Hi

the ratio of mathematics major to English majors is 3:8

..

Let x represent the constant of proportionality

3x(1.20) = 3.6x   Mathematics majors increases 20% 

8x(.85) = 6.8x    English majors decreases 15%

3.6/6.8 = 36/68  0r 9/17, the new ratio of mathematics is majors to English majors 

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