Question

Maria, Andrei si Ciprian au adunat impreuna 91 de castana. Andrei a adunat cat jumatate din numarul castanelor adunate de Maria , iar Ciprian cat jumatate din numarul castanelor adunate de Andrei.
Cate castane a adunat fiecare copil?

Answer 1

 M.I⁻⁻⁻⁻⁻I⁻⁻⁻⁻⁻I⁻⁻⁻⁻⁻I⁻⁻⁻⁻⁻I
 A.I⁻⁻⁻⁻⁻I⁻⁻⁻⁻⁻I
C. I⁻⁻⁻⁻⁻I
In total - 91
 1) 91/7=13 ( castane ) ciprian
2) 13×2= 26( castane) andrei
3) 13×4= 52 (castane ) maria