angelak461
15.04.2020 •
Biology
How are dominant genetic diseases weeded out of populations?
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Ответ:
number of non students=140, students=280
Step-by-step explanation:
let non students be x.
so according to condition, non students=x*9
students=2x*7
now,
2x*7+x*9=3220
so, x=140