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Nicola,Cristina si Diana au impreuna 24 de ani.Nicola si Cristina au impreuna 15 ani,iar Cristina si Diana 17 ani.Cati ani are fiecare fetita?

Răspuns :

N+C+D=24ani
N+C=15ani
C+D=17ani
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N=? C=? D=?

15+D=24
D=25-15
D=9ani 

N+17=24
N=24-17
N=7ani

7+C+9=24
C=24-16
C=8ani

7+8+9=
=15+9
=24ani