Question

afla nr. a ,daca ab-ac=45 si b-c =9



Afla suma b+c daca ab+ac+70=170 a=25

Answer 1

a(b-c)=45
9a=45=>a=45:9=>a=5

a(b+c)+70=170
25(b+c)+70=170
25(b+c)=170-70
b+c=100:25
b+c=4