7. Tina lost 3 pounds on the first week of her diet. She gained a pound on the second week, and then lost 2 pounds a week during every week afterwards. She has been dieting for a total of 13 weeks. How many pounds has Tina lost in all?
A. 26 pounds
B. 24 pounds
C. 22 pounds
D. 20 pounds
I THINK THIS ONE IS B
you are right
To solve this problem, we need to calculate the total weight loss for each week and then add them up.
First, let's calculate the weight loss for each week after the first two weeks:
- For the first week, Tina lost 3 pounds.
- For the second week, Tina gained 1 pound, so we add -1 to account for the weight gain.
- From the third week onwards, Tina consistently lost 2 pounds each week.
To calculate the weight loss for the remaining 11 weeks, we multiply 11 by -2 since Tina loses 2 pounds each week.
The total weight loss for the remaining 11 weeks = 11 * -2 = -22 pounds.
Now, let's calculate the total weight loss for 13 weeks by adding up the weight loss from the first two weeks and the remaining 11 weeks:
Total weight loss = 3 pounds + (-1 pound) + (-22 pounds) = -20 pounds
So the correct answer is D. 20 pounds.