Question

afla nr nat a,b,c daca a+b+c=420 , a:b=1 rest c si b=40+c

Answer 1

a+b+c=420
b=c+40
a:b=1 rest c⇒a=b+c=2c+40
2c+40+c+40+c=420
4c+80=420
4c=320
c=80
b=40+80
b=120
a=120+80
a=200