# Which one of the following could be the order, from first to last, of the student's activities?

Megan on February 16, 2020

Video explanation

Can there be a video for the game? I feel like I missed a key deduction.

on February 17, 2020

Hello @meganw,

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Meanwhile, I'll see if I can help you with this game. It is always helpful to pay attention to the variables that are tied together. They take up a lot of space. In this case, HG or MJ/JM. I am going to use HG to make diagrams, because its order is defined unlike J and M. Where can the HG block be placed? There are only 4 possibilities. (I've placed more variables, but just notice the placement of HG for now. This is what I started with.)

_ _ _ _ H G

_ _ _ H G L

_ _ H G _ _

K H G _ _ L

After placing HG, I've made 4 distinct diagrams. I'm going to try to fill them in as much as I can based on our rules.

K - HG
MJ - L or JM - L

Notice that there are a lot of possibilities for M, J, K and L within diagram one. That's ok, I'm going to leave it how it is. I generally prefer to limit myself to 4 or fewer diagrams.

In diagram 2, do you see why L has to be 6th? If M, J and L all go before HG, there would be no room for K.

When I get to diagram 3, I realize that it is not possible. There are only two remaining spots for the MJ block, and neither of them work. I cross out this entire diagram.

In diagram 4, I can definitively place K and L. M and J will be 4th and 5th in either order.

It may seem like this is taken a long time, but now I can breeze through the questions.

Question 1: I'm following my standard process of elimination. Pretty simple.

Question 2: Who can't be third? Based on our third diagram, we already know that H cannot be third.

Question 3:
A. Could be true in diagram 2.
B. Could be true in diagram 4.
C. Let's check diagrams 1 and 2. In either case, it leaves no room for M/J - L. This is the correct answer.
D. Could be true in diagram 1.
E. Could be true in 1 or 2.

Question 4: In no diagram can laundry be 5th.

Question 5: Try this strategy for rule replacement. Ask yourself:
Does this allow something that previously wasn't allowed?
Does this restrict something that previously wasn't restricted?
Fortunately, this one was pretty easy. J - L has the exact same effect as M - L, because of the JM/MJ block.