Question

Mary and Sue work at a clock factory. Mary makes clocks that chime every 9 minutes. Sue makes clocks that chime every 15 minutes. In how many minutes will their clocks chime together for the first time?

Answer 1

The first time that Mary's and Sue's clocks will chime together is after 45 minutes.

Step-by-step explanation:

To find the first time that Mary's and Sue's clocks will chime together, we need to determine the least common multiple (LCM) of 9 and 15. The LCM is the smallest number that is divisible by both 9 and 15. In this case, the LCM is 45. Therefore, their clocks will chime together for the first time after 45 minutes.