Q21

[shkim121]

The question stem says "If three sub zones are designated for each use, then allowed in Z3?"

I am not sure whether the question stem is correct because some of the answer choices are about Z1 and Z2.

This set is so tough, and this question stem makes me even more confused.

[christine.defenbaugh]

Hmmm... The question stem for #21 is "If three subzones are designated for each use, then which of the following is allowed?"

There is no reference in the question stem to Z3. Are you looking at an official copy of the PrepTest?

[shkim121]

Hmmm... The question stem for #21 is "If three subzones are designated for each use, then which of the following is allowed?"

There is no reference in the question stem to Z3. Are you looking at an official copy of the PrepTest?

Thank you very much.
I think this is an official copy because I downloaded it from ManhattanLSAT.

[tommywallach]

Hey Sh,

Do you still have a question about this one, or was it a misread on your end?

-t

[tara_amber1]

I'll pipe up since it's still confusing to me. I hate that "use" is not that clarified. I didn't know what associated with zone, or subzone. Totally lost on this game.

In terms of the question, is it saying to imagine that there's 3 subzones per zone? Or 3 different subzones spread amongst the 3 zones, (Z1 = H, Z2 = I, Z3 = R, for example)?

[rinagoldfield]

Thanks for your post, tara_amber1.


This is a hard and weird game! Agreed that “use” and “zone” are confusing here.

First, let’s examine the question stem:

“Three subzones are designated” … ok! That means we’re talking about subzones and their designation. Designation, we know from the original setup, refers to “housing, industrial, or retail use.” So, we know that three subzones are about to get assigned housing, industrial, or retail use.

Next, the question tells us “three subzones are designated for each use.” “Each” here means “every one of the options.” So we have three of each: 3 housing, 3 industrial, and 3 retail.

What can we do with this information? Let’s make inferences. I’ve attached below a diagram with inferences, but I’ve also spelled them out here.

Inferences

How can these 9 subzones be spread out across the three zones?

We know that housing and industrial can’t overlap. So we have to chunk housing and industrial away from each other.

We know that we can’t have three housing together. Therefore, we must have 1 housing in one zone, and 2 housing in another zone. Again, we can’t have one housing in each of the three zones because otherwise there would be no place to put industrial.

Since no zone with housing can contain industrial, our remaining zone must have all three industrial subzones. That’s the only place industrial can go without bumping into housing.

So far, we’ve chunked these subzones to spread across the three zones:

H
HH
III

We don’t know which zones these chunks go in, but we know they have to be together.

Where can retail go? Well, since retail can’t go in zone 1, we know that we can’t have one retail per zone. Can we have a group of 3 retails in a single zone? No, because housing can’t be with more than one retail, and because industrial can’t be with three retail.

Therefore, our retails must be chunked like this:

R
RR

Per the rules, the RR can’t go with housing. Therefore, the RR chunk must go with the III chunk. Check out the attachment to see this visually laid out.

***

We’ve made inferences. Now let’s go to the answer choices. Our right answer choice could be true and our four wrong answers must be false.

A) MBF. The 3 I’s must go together
B) CBT. Correct.
C) MBF. The 3 I’s go with R, and the III chunk goes with the RR chunk
D) MBF. The III chunk goes with 2 R’s, not 1.
E) MBF. There is no RRR chunk.

Hope this helps!

[esthertan0310]

thank you very much!