Final answer:
To find the value of d, we need to set up an equation based on the given information and solve for d.
Step-by-step explanation:
To solve this problem, we need to set up an equation based on the given information. Let's assume the number Andrew thinks of is d. According to the question, when he triples it and adds 13, the result is less than 44. This can be represented as equation 3d + 13 < 44. To solve for d, we need to isolate it by subtracting 13 from both sides and then dividing by 3. So, 3d + 13 - 13 < 44 - 13 becomes 3d < 31. Dividing both sides by 3, we find that d < 10.33. Therefore, the value of d must be less than 10.33.