Question

Five bells start ringing together. If the bells ring at intervals of 12, 18, 25, 40 and 54 seconds respectively, after what interval of time will they ring together again? ​

Answer 1

All bells will together after exactly 420 seconds (which is the L.C.M of 6,5,7,10 and 12 seconds) or in 7 minutes. So within one hour i.e. in 60 minutes the bells will toll together 8 times excluding the one at the start.

Answer 2

Answer:31)C

32)D

33)A

34)C

35)D

36)A

37)B

38)C

39)C

40)A

41)C

42)A

43)B

44)A

45)

Step-by-step explanation: