Question

Diana, Camelia si Corina au colectionat impreuna 154 de ilustrate, Diana si Camelia au impreuna 89 de ilustrate, iar Camelia si Corina au impreuna 118 ilustrate. Cate ilustrate au colectionat fiecare fetita?

Answer 1

a+b+c=154
a+b=89 si b+c=118
89+c=154, rezulta c=65
b+65=118, rezultab=53
a+53=89,rezulta a=36
36+53+65=154

Answer 2

a+b+c=154
a+b=89
b+c=118
89+c=154
c=65 ilustrate a colectionat corina
a+118=154
a=154-118
a=36 ilustrate a colectionat Diana
36+b+65=154
b+101=154
b=154-101
b=53 ilustrate a colectionat Camelia