Question

Daca alb= 3 rest 5
a-b=17
afla a=?

Answer 1

a=3b+5 iar
 a-b=17⇒a=17+b
il inlocuim pe a=17+b in prima relatie
si obtinem
17+b=3b+5
17-5=3b-b
12=2b ⇒ b=12÷2 ⇒b=6
a=17+b⇒a=17+6 ⇒a=23