The LCM of 8 and 10 is 40
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8:30 AM. The bell rings at 8, at 8:10, 8:20, and 8:30. The buzzer goes off at 8, 8:15 and 8:30. And at about 8:45, I'm going to silence one or both of them by unplugging them....
15 and 10 are both factors of 30.
7 and 8 both go into 56
104
154 ÷ 18 = 8 remainder 10