The number of years t, the number of students in both high schools would be the same is 15 years
let
School A:
1000 + 35t
School B:
700 + 55t
1000 + 35t = 700 + 55t
1000 - 700 = 55t - 35t
300 = 20t
t = 300/20
t = 15 years
Therefore, the number of years t, the number of students in both high schools would be the same is 15 years
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