Question

{x+y=450,60%y-40%x=30

Answer 1

x+y=450 x=450-y

60%y-40%x=30

0.6y-0.4x=30

6y-4x=300

6y-4(450-y)=300

6y-1800+4y=300

10y=2100

y=210 x=240