Answer:
Ben takes 40 tablets in 7 days.
Explanation:
On day 1 Ben takes 4 tablets TWICE a day
On day one Bens had 8 tablets
On day 2 - 6 Ben takes 3 TWICE a day
Day 2, 3, 4, 5, and 6, 30 tablets are taken all together
Then on day 7, Ben takes 1 tablet TWICE a day
On day 7 Ben took 2 pills.
Add everything up and you get 40 tablets.