Question

maria , Andrei si Ciprian au adunat impreuna 91 de castane . Andrei a adunat cat jumatate din nr castanelor adunate de Maria , iar Ciprian cat jumatate din nr castanelor adunate de andrei . cate castane a adunat fiecare copil ?

Answer 1

M+A+C=91
A=M/2     M=2A
C=A/2
2A+A+A/2=91
3A+A/2=91
6A/2+A/2=91
7A/2=91
7A=91*2
A=182:7
A=26 Andrei
A=M/2       26=M/2     M=26*2    M=52 Maria
C=A/2=26/2=13   C=13 Ciprian
proba 52+26+13=91