Question

daca a+b+c=20 si a+b=12 iar b+c=15 care sunt numerele a b c?

Answer 1

a+b+c = 20

a+b = 12 =>  a = 12 - b

b + c = 15 => c = 15 - b

12 - b + b + 15 - b = 20

27 - b = 20

b = 27 - 20

b = 7

a = 12 - 7

a = 5

c = 15 - 7

c = 8