Question

x+y=300,x:y=5;x+y=920

,x-y=540

Answer 1

x+y=300
x=5y             =>y+5y=300 =>6y=300 =>y=50 =>x=250

x+y=920
x=540+y    =>2y+540=920 =>2y=380 =>y=190 =>x=630

Answer 2

x+y=300
x:y=5
x=5y
5y+y=300
y=300:6
y=50
x=250

x+y=920
x-y=540
920-540=380
380:2=190
x=190+540=730
y=920-730=190