1. **State the problem:** Andrew is thinking of a number that is greater than 40 and less than 52, and this number has 3 ones in it. 2. **Analyze the problem:** The number must be between 40 and 52, so possible numbers are 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51. 3. **Check the condition of having 3 ones:** The phrase "has 3 ones" means the digit '1' appears three times in the number. 4. **Evaluate each candidate:** None of the numbers between 41 and 52 have three '1's. The only number with '1's is 41 (one '1'), 51 (one '1'), and 50 (zero '1's). 5. **Reconsider the problem:** Since no number between 40 and 52 has three '1's, the problem likely means the number has three '1's in its digits when written in some other form or the problem might be interpreted differently. 6. **Alternative interpretation:** The problem might mean the number has three '1's in its decimal representation, which is impossible here, or it might mean the number is 41 (which has one '1') and the '3 ones' refers to something else. 7. **Conclusion:** The only number between 40 and 52 with a '1' digit is 41 and 51, but neither has three '1's. Since the problem states Andrew's number has 3 ones, and the only number with three '1's is 111, which is not between 40 and 52, the problem might have a typo or error. **Final answer:** There is no number between 40 and 52 that has three '1's. Possibly the intended number is 41 or 51, but neither has three '1's.