Answer:
Question 1:
So you have 80 gummies and take 2 a day for 40 days
2(40) = 80
So at the end of 80p days, 0 gummies will be left
Question 2:
Now you have 90 and take 3 a day for 40 days
3(40) = 120
You will not have enough to cover the entire 40 days if you take 3 a day.
Hope this helps :)