Question

dana si ina au impreuna 50 de timbre.daca dana isi injumatateste numarul,iar ina si-l dubleaza,atunci fetet au acelasi numar de timbre.aflati cate timbre are fiecare

Answer 1

d+i=50timbre;
d/2=2i
⇒d=2·2i⇒d=4i;
⇒4i+i=50
⇒5i=50
⇒i=10[timbre-Ina];
⇒d=4·10
⇒d=40[timbre-Dana];