Mama jest starsza od syna o 21 lat.Ile lat ma mama,a ile syn,jeśli za 10 lat będą mieli razem 55 lat?
s - syns+21 - mama
s+10+s+31=55
2s+41=552s=14 /:2s=7
mama ma 28 lat a syn 7.
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s - syn
s+21 - mama
s+10+s+31=55
2s+41=55
2s=14 /:2
s=7
mama ma 28 lat a syn 7.