Opal went to the cookery class once every 2 days while Olivia went to the same cookery class once every 5 days. They became friends after meeting each other at the cookery class on a Sunday. Which would be the next earliest day that they would meet each other again at the cookery class? Give the answer in number. (Eg Mon = 1; Tue = 2)
Multiples of 2: 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24
Multiples of 5: 0, 5, 10, 15, 20
Lowest common multiple of 2 and 5: 10
Number of weeks in 10 days
= 10 ÷ 7
= 1 r 3
By looking at the remainder, we count 1 week and 3 days from Sunday is a (3) Wednesday.
Answer(s): 3