How many days do you have both lessons on the same day again if you have piano lessons every second and Tuba lessons every three days?

To find out when you have both lessons on the same day, you need to determine the least common multiple (LCM) of the two lesson intervals. Piano lessons occur every 2 days, and Tuba lessons every 3 days. The LCM of 2 and 3 is 6, meaning you will have both lessons on the same day again in 6 days.