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nadira = 3/4 nasya
nadira + nasya = 21
3/4 nasya + nasya = 21
7/4 nasya = 21
nasya = 21 x 4/7
nasya = 12 tahun
nadira + 12 = 21
nadira = 9 tahun
7/4 nasya = 21
nasya = 12
nadira = 21 - 12 = 9
jadi umur nasya = 12 th, dan umur nadira 9 th
semoga bermanfaat