Question

a-b=200 si a=5b. a=? b=?

Answer 1

5b -b = 200
4b=200
b=200  : 4 = 50
a=5·50 =250
b = 50

Answer 2

$a-b=200\\a=5b\\*********\\5b-b=200\\4b=200\\\bold{b=50} \\ \\ a-50=200\\a=200+50=\ \textgreater \ \bold{250}$