My friends, John and Joe, never come to see me on a Monday, but do come to see me at least 5 and
sometimes 6 times each week. John eats 2 apples per visit, sometimes 3. Joe always eats 4 apples per visit It is Monday today, and I only have 12 apples.
How many apples must I buy in order to make sure that I do not run out of them during the upcoming 2
weeks?