What is the least common multiple of and ?
What is the lowest common multiple of 39 and 65?
A bus stop has two bus lines: the red line and the blue line. The red line stops every minutes, and the blue line stops every minutes. If the buses of both lines have just simultaneously stopped at the bus stop, how many minutes later will the buses of the two lines meet at this bus stop again?
If the lowest common multiple of and is , what is
What is the least common multiple of 12 and 21?