# Puzzle #216: Sandwiches

The local corner store has 12 sandwiches in the cooler. Five have corned beef, seven have cheddar cheese, and six have Swiss cheese. Each sandwich has at least one of the three ingredients, and there is at least one sandwich of each of the seven ingredient combinations. Exactly three sandwiches contain both types of cheese. Two sandwiches contain all three ingredients.

How sandwiches are there of each type?

Submit your answer to Gene Wirchenko <genew@telus.net>. Your answer should be in the form of a proof. That means to show how your answer must be correct. The deadline is Wednesday, July 25, 2017 at noon Pacific Time. I will post the answer shortly after.

# How Much Do You Know? and Training

At my new job, I am still learning how to do things. One of my co-workers, who is a nice enough person, does not seem to understand how much he knows about the job that I do not.

He said that he had told me everything about a weighing program we use. He actually had not. I have had to fill in the details so that I can use the program effectively.

I see this situation quite a bit.

Another example is games. You have a board game that you like playing. How easily can you explain to someone else how to play it?

Some people can not explain very well at all. One can get very confused trying to learn from them.

Some are very good at it. I am in this category, because I have worked at it. One of the benefits of a background in systems analysis is that I am good with how systems work. By breaking things down into their component parts, one can make a complex system simpler to understand.

That person who does not get how something works when you know quite well how it works is probably not stupid. He could just be missing a few details that are obvious to you but not to him.

How about giving him those details?

# Odd Language #212: Who Is Authorised?

There is a sign at my new job:
FIRE ASSAY
EMPLOYEES ONLY
NO UNAUTHORIZED
ENTRY

The issue: This is on a door to the Fire Assay area. Should it be read as “This is the Fire Assay area. Only employees are allowed in.” or “Only Fire Assay employees are allowed in.”? I had to ask, and it is the latter because of the lead compounds used.

# Puzzle #215: Divvying Up Candy

Six kids were given a bag of candy and told to split it evenly. When they tried to do so, there was one piece of candy left over. There would have been one piece of candy left over if there were only two, three, four, or five kids, too. What is the minimum number of pieces of candy there could be in the bag if there were at least ten pieces of candy?

Submit your answer to Gene Wirchenko <genew@telus.net>. Your answer should be in the form of a proof. That means to show how your answer must be correct. The deadline is Wednesday, July 19, 2017 at noon Pacific Time. I will post the answer shortly after.