Ben exercises every 3 days and Isabel every 2 days if Ben and Isabel both exercised today how many days in the next 30 days will they both be exercising on the same day?

Ben exercises every 3 days, so he will exercise on days 0, 3, 6, 9, 12, 15, 18, 21, 24, 27, and 30. Isabel exercises every 2 days, so she will exercise on days 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, and 30. They will both exercise together on days 0, 6, 12, 18, 24, and 30, giving a total of 6 days in the next 30 days.