Jawaban:
a - 2 + b - 2 = 20
a + b - 4 = 20
a + b = 24
a + 20 = 24
a = 4
a - 2 = 4 - 2
= 2 tahun
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Jawaban:
a - 2 + b - 2 = 20
a + b - 4 = 20
a + b = 24
a + 20 = 24
a = 4
a - 2 = 4 - 2
= 2 tahun