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Kelas 7 MatematikaBab Perbandingan dan Aritmatika Sosial
M - 5 = 2 (N - 5)
M = 2N - 10 + 5
M = 2N - 5
M + 10 = 1 1/2 (N + 10)
2N - 5 + 10 = (3/2) (N + 10)
2 (2N + 5) = 3 (N + 10)
4N + 10 = 3N + 30
4N - 3N = 30 - 10
N = 20 tahun
Umur Nada 5 tahun kemudian
N + 5 = 20 + 5
N + 5 = 25 tahun