soviet85
03.02.2021 •
Mathematics
A student survey 100 adults who either took vitamin C zinc or echinacea Supplements to prevent getting a cold
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Ответ:
let these two numbers be x and y
x+y = 82
x-y = 29
If you add the two equations you can eliminate y.
2x = 111
x= 55.5
Plug x back into one of the two equations. So the two numbers are 55.5 and 26.5.