At first I picked A. Is that wrong because this clause "Yamamoto must visit Ghana in a month immediately preceding a month in which Watts visits Ghana", that anytime there is a W you need a Y before it? I read it originally that Y must visit at least one time in a month before W, not any time before W. Please explain the language of the clause. Thanks.
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Yes I am also wondering why A is wrong. Please explain.
Victoriaon July 2, 2020
Hi @avif and @filozinni,
Happy to help!
We know there are four representatives - V, W, Y, and Z. Over the next four months, they will visit three factory sites - France, Ghana, and India. Exactly one representative will visit each site per month.
F: _ _ _ _ G: _ _ _ _ I: _ _ _ _
Let's quickly go through the conditions
Rule 1 - V must visit Ghana once and India twice, with Ghana visited at some time between the visits to India
Rule 2 - W must visit Ghana at least once
Rule 3 - Y must visit Ghana in a month immediately preceding a month in which W visits Ghana
Rule 4 - Y cannot visit any site in the fourth month
Rule 5 - Any representative who visits France cannot also visit India
So, Rule 3 tells us that Y must visit Ghana in a month immediately preceding a month in which W visits Ghana. This means that Y must visit Ghana the month before W visits Ghana. There can be no months in between. We also know from Rule 2 that W must visit Ghana at least once.
As Y visits Ghana once and V visits Ghana once, this means that the maximum number of times that W can visit Ghana is twice.
If we assume that W only visits Ghana once, then Y must visit Ghana in the month immediately before W visits Ghana. This means that W cannot visit Ghana in the first month as there is no month immediately preceding it.
If we assume that W visits Ghana twice, then there are two possibilities for order of visits.
Option 1:
F: _ _ _ _ G: W Y W V I: _ _ _ _
This option does not work because Rule 1 tells us that V must visit Ghana in between their visits to India. Therefore, V cannot visit Ghana in the last month.
Option 2:
F: _ _ _ _ G: W V Y W I: V
Rule 1 means that V must visit India in the first month and then either the third or fourth month.
Rule 4 tells us that Y cannot visit any site in the fourth month and Rule 5 tells us that any representative who visits France cannot also visit India.
This is where this option falls apart. V cannot visit France because they must visit India. Therefore, the fourth month is impossible because France and India would have to be visited by V and Z as Y cannot visit any site in the fourth month.
Hope this is helpful! Please let us know that you have any further questions.
