Question

Four ladies ring bells at intervals of 12,18,20,30 minutes respectively. If they start tolling together, what time after will they next toll together?​

Answer 1

Answer:

we need to find LCM(12,18,20)

12 2² x 3

18 = 2 x 3²

20 2² x 5 1cm 2² x 3² x 5 = 180

all three bell will rang together after 180 min or 3 hours

Step-by-step explanation:

Icm (12,18,20) Lcm=180 therefore they will ring again at the same time together after 180 minutes which is 3 hours. Hope it helps!!