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40 = 2³ × 5
KPK = 2³ × 3 × 5 = 120 dtik = 2 mnit
1/2 jam = 30 mnit
30 : 2 = 15 kli tpukn
40 = 2³ x 5
30 = 2 x 3 x 5
KPK = 2³ x 3 x 5 = 120 detik -----> bertepuk bersama
maka
selama 1/2 jam = 1800/120 = 15 kali tepukan bersama