So, 40 pounds ÷ 4 pounds/week = 10 weeks
Therefore, it will take approximately 10 weeks to lose 40 pounds if you consistently lose 4 pounds a week.
However, it's important to note that weight loss can vary from person to person and can be influenced by factors such as diet, exercise, genetics, and overall metabolism. Some weeks you may lose more weight, and other weeks you may lose less. Consistency and a balanced approach are key to achieving your weight loss goals.