tolong bantu jawab ya

5. FPB =
63 = 3×3×7
84 = 2×2×3×7
90 = 2×3×3×5
FPB = 3 ( A )


6.KPK =
6 = 2×3
15 = 3×5
KPK = 2×3×5 = 30
= 30 + 18 April 2012
= 48 April 2012- 30
= 18 Mei 2012 dan 17 juni 2012 (C)