Question

alin are cu 20 de.timbre mai multe decat Radu. daca Radu are de 3 ori mai putine decat Alin afla cate timbre are fiecare​

Answer 1

Răspuns:

20+R=A

R÷3=A

20+R=R÷3

20=R-R÷3

R+R×3=-20

4R=-20

R=-5

20+R=A

20-5=A

A=15