Răspuns :
Răspuns: 1 nr=70, al doilea nr=50
Explicație pas cu pas:
fie x-al doilea
(x+20)-primul nr
x+x+20=120
2x=120-20
2x=100
x=50-al doilea nr
50+20=70-primul nr
a+b+c=120
b=a-20
c=?
a__________|___
b__________
a+b=120
a+a-20=120
a+a=100
=>b=50
a=b+20
a=70
b=a-20
c=?
a__________|___
b__________
a+b=120
a+a-20=120
a+a=100
=>b=50
a=b+20
a=70