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Umur nina = b
a=b+3
a+b<15
maka b=....
a+b<15
(b+3)+b<15 (substitusi nilai a)
2b+3<15
2b<12 (kedua ruas kurangi 3)
b<12
maka kemungkinan yang sesuai pernyataan diatas
a=7 dan b=4
umur nina = 4tahun