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Verified answer
Misalkanumur adik = a
umur kakak = b
a = 2/3b
a + b = 30
2/3b + b = 30
5/3b = 30
b = 30 x 3/5
b = 18
a + b = 30
a + 18 = 30
a = 30 - 18
a = 12
maka
umur adik = 12 tahun
umur kakak = 18 tahun
Verified answer
A = 2/3 × KA + K = 30 tahun
A : K = 2 : 3
A = 2/(2+3) × 30
A = 2/5 × 30
A = 12 tahun
K = 3/(2+3) × 30
K = 3/5 × 30
K = 18 tahun
Jadi umur kakak dan umur adik adalah 18 tahun dan 12 tahun