Question

Fie a si b numere naturale astfel incat 20%din a =50% din b si 3a-9b+2=0. Aflati a si b , va roog!!

Answer 1

20%a=50%b
b=20%a/50%=2a/5=0,4a
b=40%a

3a-9b+2=0
3a-9×40%a+2=0
3a-9×0,4a+2=0
3a-3,6a=-2
0,6a=2
a=2/0,6=3,(3)
b=0,4×3,(3)=1,(3)