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Verified answer
Mapel : MatematikaBab : KPK dan FPB
Mencari KPK
20 = 2² x 3
15 = 3 x 5
24 = 2³ x 3
KPK = 2³ x 3 x 5
= 8 x 3 x 5
= 120 detik
= 120 : 60
= 2 menit
Jadi, ketiga lampu tersebut akan berkedip bersamaan setiap 2 menit sekali