LSAT PrepTest 43 Section 4 Question 19 Explanation | Logic Games

I didn't write the following blog post. It was already on the blog when I took over the URL. The following blog post may contain mistakes. -Steve

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Here's a Logic Games question from the June 2004 LSAT.

Solution

We can't solve this only by looking at the rules, so let's create a diagram that violates as many of the answer choices (to eliminate them) as possible. We'll make it step-by-step, following the rules. We know the falafel and hot dog trucks serve Y, so let's put them in:

X:
Y: F H
Z:

The rules say T serves two buildings but not Y, so it must serve X and Z. That rule also says that I serves those same two, so:

X: T I
Y: F H
Z: T I

F serves two buildings and P doesn't serve those, so let's put F with X and put P with Z. Let's put S with Y so that Y will be served by a total of three trucks, as the rules say, and so I will serve more buildings than S, as the rules say.

X: T I F
Y: F H S
Z: T I P

Now, we have satisfied all the rules. Let's look at the choices. A and B are out because neither situation applies to this correct diagram. D is out and so is E, for the same reason. The only choice remaining is C, so C is correct.

Remember:

Create a diagram by carefully following the rules and constructing it step-by-step, and try to violate as many choices as you can.