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Y = 9/7 A
→ A = 7/9 Y
Y - A = 4
Y - 7Y/9 = 4
2Y/9 = 4
Y = 4 x 9/2
Y = 36/2
Y = 18 tahun
adiknya = 7/9 daru yaya
Yaya-adiinya =4
Yaya-7 Yaya/9 =4
2 yaya/9 =4
yaya =4×9/2
yaya=36/2
yaya=18 tahun
jadi umur yaya 18 tahun