ROBERT NUMBER IS BETWEEN 20 AND 32. THE SUM DIGITS IS 10. WHAT IS ROBERT NUMBER? I KNOW ANSWER IS 28 BUT NEED TO KNOW STEP BY STEP HOW TO GET TO 28?

Only one of these numbers has digits that add up to 10.

21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31

To find Robert's number, which is between 20 and 32 and has a sum of digits equal to 10, let's go step by step:

1. Start by examining the given range: between 20 and 32.

2. Check each number in the range and calculate the sum of its digits:

- For 20: The sum of its digits is 2 + 0 = 2.
- For 21: The sum of its digits is 2 + 1 = 3.
- For 22: The sum of its digits is 2 + 2 = 4.
- For 23: The sum of its digits is 2 + 3 = 5.
- For 24: The sum of its digits is 2 + 4 = 6.
- For 25: The sum of its digits is 2 + 5 = 7.
- For 26: The sum of its digits is 2 + 6 = 8.
- For 27: The sum of its digits is 2 + 7 = 9.
- For 28: The sum of its digits is 2 + 8 = 10.

Since the question states that the sum of the digits should be 10, we can conclude that this is the correct answer.

3. Therefore, Robert's number must be 28, as it satisfies the conditions given: it is between 20 and 32, and the sum of its digits is indeed 10.