Question

Daca a+b+c=32, si a=15-b, afla numarul c.

Answer 1

inlocuiesti a doua ecuatie (a=15-b) in prima ecuatie data .
=> a+b+c=32
(15-b)+b+c=32
15-b+b+c=32
c+15=32
c=32-15
c=17