Question

Nancy's birthday is between August 10 and August 24. The date of her birthday is not an even number. The sum of the digits is 4. Show how to find the date of Nancy's birthday.

Answer 1

Possible dates:

11, 13, 15, 17, 19, 21, 23

Which of these numbers have digits that add up to 4?

Answer 2

13

Answer 3

21