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Maria si Bianca au impreua 7 mere.
Maria si Catalina au impreuna 8 mere.
Cate mere are Maria:?


Răspuns :

m+b=7
m+c=8

m+b+c=12

c=12-7= 5 mere are Catalina

b=12-8=4 mere are Bianca

m=7-4=3 mere are Maria