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Junior = 39
Senior = 47
Perbandingan jumlah
Ini menggunakan perbandingan berbalik
rata-rata usia - junior = 42 - 39 = 3
senior - rata-rata usia = 47 - 42 = 5
Maka perbandingan jumlah
Junior : Senior = 5 : 3
Senior = 47-42 = 5
Dibalik perbandingannya, jadinya J:S= 5:3