Question

Afla ab stiind ca a+b=25 a=b:4

Answer 1

a=b:4⇒b=4*a
a+b=25
a+4*a=25
5*a=25
a=25:5
a=5
b=5*4
b=20

Answer 2

b:4+b=25(aducem la acelasi numitor)
5b supra 4=25
5b=25 ori 4
5b=100
b=100:5
b=20
a=20:4
a=5