Răspuns :
a-Mihaela
b-Mihai
a=7b/10
a=b-30
b-30=7b/10
10b-300=7b
3b=300
b=100 lei
a=7.100/10=70 lei
b-Mihai
a=7b/10
a=b-30
b-30=7b/10
10b-300=7b
3b=300
b=100 lei
a=7.100/10=70 lei
Fie x-suma lui Mihai
Mihaela are 7/10*x=10/10*x-3/10*x
Mihaela are x-3x/10
stim ca Mihaela are x-30 lei
egalez⇒ 3x/10=30⇒ x=30*10/3=100 lei
100-30=70 lei are Mihaela
Mihaela are 7/10*x=10/10*x-3/10*x
Mihaela are x-3x/10
stim ca Mihaela are x-30 lei
egalez⇒ 3x/10=30⇒ x=30*10/3=100 lei
100-30=70 lei are Mihaela