Question

Maria,Andrei si Ciprian au adunat impreuna 91 de castane . 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+A+C=91
2A=M
2C=A
M=4C
4C+2C+C=91
91:7=13
C=13
A=13*2
A=26
M=26*2
M=54

Answer 2

M+A+C=91
2A=M
2C=A
M=4C
4C+2C+C=91
91:7=13
C=13
A=13*2
A=26
M=26*2
M=54