| From the introduction, Mrs. Crane visited six classes in order from 7:00 p.m.
onward, with the classes being in rooms 110, 119, 207, 222, 302, and 308.
By clue 2, after attending World History, she went down one floor to see
Ms. Hardy; while by clue 6, after attending Mr. Bunsen's presentation, she
stayed on the same floor to visit Spanish 2. Therefore, four different
classes are named between clues 2 and 6. Since three classes are given in
clue 4, then, either clue 2 or clue 6 or both must overlap clue 4. There
are two ways for clues 4 and 6 to overlap: Mr. Bunsen teaches Algebra or Mr.
Clemens teaches Spanish. Trying the first possibility, Mrs. Crane would
have visited Mr. Clemens' class, then would have been in room 207, then in
Mr. Bunsen's Algebra class, and next in Spanish 2. Since Mrs. Crane went
up two floors between classes on one occasion (clue 8), Mr. Bunsen's class
and the Spanish 2 class (6) couldn't be on the 3rd floor following class
in 207 and would be on the 1st floor followed by a class on the 3rd floor
to satisfy clue 8--but there would be no way for the other part of clue 8,
where Mrs. Crane went down two floors in changing classes, to now work.
Trying the second possible way to combine clues 4 and 6, if Mr. Clemens were
the Spanish 2 teacher, then Mrs. Crane would have been in Mr. Bunsen's class
followed by Mr. Clemens' Spanish 2, room 207, and Algebra in consecutive
order (4). However, there is no way for clue 8 to work given this
arrangement; since Mr. Bunsen's and Mr. Clemens' rooms would be on either
floor 1 or floor 3 and Mrs. Crane would be in 207 afterwards, one of the
two changes in clue 8 could not occur. So, clues 4 and 6 give five different
classes; and the overlap must be between clues 2 and 4 or seven different
classes would be mentioned. Overlap between clues 2 and 4 can be either
that Mr. Clemens teaches World History or that World History is in room 207.
If Mr. Clemens taught World History, then Mrs. Crane would have visited
that class followed by Ms. Hardy's in 207 and Algebra (2, 4). Mr. Clemens'
room would be on the 3rd floor (2). By clue 6, Mr. Bunsen's and the
Spanish 2 rooms would be on the 1st floor. Since by clue 8 Mrs. Crane
went up two flights in one class change and down 2 in another, the only
way clue 6 can work given this arrangement is for Mrs. Crane to have been
on the 3rd floor first, followed by Mr. Bunsen's and the Spanish 2 classes
on the 1st floor, followed by Mr. Clemens' class. By clue 5, the first
class Mrs. Crane attended would have to be Mr. Nixon's in 308, with C
Programming then Mr. Bunsen's subject--no (1). So, clues 2 and 4 overlap
with Mrs. Crane visiting Mr. Clemens' class followed by World History in 207
and then Ms. Hardy's Algebra session. Ms. Hardy's class would have to be
on the 1st floor (2). Then in clue 6, since Mr. Bunsen's and the Spanish 2
class are on the same floor, those classes would be on the 3rd floor. If
Mrs. Crane had been in the clue 6 classes before being in the clue 4 ones,
in order for clue 8 to work, she would have been on the 1st floor first and
then in Mr. Bunsen's class and Spanish 2, followed by Mr. Clemens' session.
on the 1st floor--but there would be three classes on the 1st floor, no by
the introduction. So, the visits to the clue 6 classes follow Ms. Hardy's.
Mrs. Crane can't have attended Spanish 2 last, or there would be no way for
her to have gone down two floors during class changes. Mrs. Crane was in
Mr. Bunsen's room immediately after being in Ms. Hardy's, then attended the
Spanish 2 presentation (6) followed by the final class on the 1st floor (8).
By clue 5, Mr. Nixon in 308 teaches Spanish 2, with C Programming then the
last class visited. Mr. Bunsen is in room 302. By clue 1, Mr. French is
the World History teacher, with Ms. Gates teaching C Programming--in room
110, with Algebra in room 119. Since by elimination Mr. Clemens teaches in
room 222, he teaches English (3); Mr. Bunsen is Bobby Crane's Earth Science
instructor. In sum, Mrs. Crane visited Bobby's classes on Back to School
Night as follows:
- 7:00 -- Mr. Clemens, English, 222
- 7:15 -- Mr. French, World History, 207
- 7:30 -- Ms. Hardy, Algebra, 119
- 7:45 -- Mr. Bunsen, Earth Science, 302
- 8:00 -- Mr. Nixon, Spanish 2, 308
- 8:15 -- Ms. Gates, C Programming, 110
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