Use least common multiple or greatest common divisor to solve the problem.
-Three clocks chime every 21 minutes, 39 minutes, and 91 minutes, respectively. If the three clocks chime together, how much time must pass before they will chime together again?
A)273 minutes
B)3549 minutes
C)151 minutes
D)819 minutes

Question

Quizplus · Accepted Answer

To find when the clocks will chime together again, we calculate the least common multiple (LCM) of their chime intervals: 21, 39, and 91. The LCM of 21, 39, and 91 is 273. This means the clocks will chime together again after 273 minutes.

Use Least Common Multiple or Greatest Common Divisor to Solve