The set days of the week are Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday. And odd number is a number not divisible by two. For example, 1, 3, 5, 7, 9, 11, etc are all odd numbers. The number of letters in the days of the week are: Monday - 6 Tuesday - 7 Wednesday - 9 Thursday - 8 Friday - 6 Saturday - 8 Sunday - 6 So we can see that the only odd numbers here are 7 and 9. Therefore your answer is Tuesday and Wednesday.