Question

Doi prieteni au impreuna 241 de nuci. Cate nuci are fiecare copil daca unul are de 3 ori plus 7 mai multe decat celalalt?

Answer 1

a+b=241
a=3b+7
⇒[3b+7]+b=241
⇒3b+b=241-7
⇒4b=234
⇒b=234/4
⇒b=58,5[nuci-al dilea copil];
⇒a=3b+7
⇒a=3·58,5+7
⇒a=175,5+7
⇒a=182,5[nuci-primul copil];