Please help me the question is. Marco's grandmother and his uncle both called Marco today.
• Marco's grandmother calls him once every 6 days.
• Marco's uncle calls him once every 9 days.
How many days will it be until they both call him on the same day again
The common multiples of 6 and 9 is 18, 36, 54, etc. 18 is the first common multiple so Marco's grandparents willl call Marco on the 18th day. please boost me
