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(1020 + 648 ) : 24
1668 : 24 = 69,5
Jadi rata2 gabungan kelompok A dan B adalah 69,5
= 15 × 68 + 9 × 72 / 15 + 9
= 1020 + 648 / 24
= 1668 / 24
= 69,5