Roshel went to the aerobics class once every 9 days while Ivory went to the same aerobics class once every 2 days. They became friends after meeting each other at the aerobics class on a Friday. Which would be the next earliest day that they would meet each other again at the aerobics class? Give the answer in number. (Eg Mon = 1; Tue = 2)
Multiples of 9: 0, 9, 18
Multiples of 2: 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24
Lowest common multiple of 9 and 2: 18
Number of weeks in 18 days
= 18 ÷ 7
= 2 r 4
By looking at the remainder, we count 2 weeks and 4 days from Friday is a (2) Tuesday.
Answer(s): 2