Please can anybody help me solve this puzzle;
The doctor has prescribed some medication. You must take 1 pill every 20 minutes for the first hour. Then at the beginning of the second hour 2 pills every half hour. Given that the container holds 20 pills in total you must follow doctors orders.
How long will the treatment last.
How many pills will be left over ?
could be argued that the treatment stopped at 4.5 hours, as that was when the last sets of 2 pills could be taken. Do you know what the correct answer is?