Question

Bantu aku yg no 1-3, Penting nih

Answer 1

1. Lampu I = 12 dtk
    Lampu II = 30 dtk
    Lampu III = 66 dtk

12 = 2² × 3
30 = 2 × 3 × 5
66 = 2 × 3 × 11
KPK = 2² × 3 = 12
Lampu menyala bersama pada = 8.30 + 12 = 8.42

No 2 sama 3 nggak dong maksudnya,,
maaf klo salah