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siti = 7/2 × 8 = 28 tahun
mina = 5/2 × 8 = 20 tahun
jumlah umur = 28 +20=...
jadikan jawaban terbaik
mirna = y
x/y = 7/5
x = 7/5 y
x - y = 8
7/5 y - y = 8
2/5 y = 8
y = 20
x = 7/5 y
x = 7/5 x 20
x = 28
maka jumlah umur
x + y = 28 + 20
= 48 tahun