If Henry's lesson is scheduled for a day either immediately before or immediately after Tom's lesson, then Grace's le...
RachPFebruary 23, 2022
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I was able to solve this quickly using the past hypotheticals in which Tom was right next to Henry, but could this be a flawed method to choose my answer?
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Hypotheticals are indeed a valid way to get to the right answer, although there might be another way that would be faster and less prone to spending a lot of time on hypotheticals.
Since we know that G is three days before S, and S is before U, There must be at least 4 days after G- so G can only go in days 1 or 2. Lets try testing out G in 1 below
G _ _ _ _ _
We know that S is three days after G, and that if J is not 1 J is 3, so we would now have
G _ JS_ _ with U in one of the final two. Since there is not open block of two for H and T to be next to each other, this scenario is impossible, and so G must go in 2.
