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n(risoles) = 3 x 30 = 90
faktorisasi prima 120 = 2³ x 3 x 5
faktorisasi prima 90 = 2 x 3² x 5
FPB = 2 x 3 x 5 = 30
banyak piring = 30 buah
banyak risoles tiap piring = 90/30 = 3 buah