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Salak = S.....Apel = A......Jeruk = J
3A + 2J = 9S
A + 3J = 6S...>( KALI 3)
3A + 2J = 9S
3A + 9J = 18S -
7J = 9S
J = 9/7 S
J = 1 2/7S
1 jeruk = 1 2/7 Salak