| By clue 5, the student who deserved an F mistakenly received a B from
Mr. Slapdash. The student who mistakenly received an A would also
have gotten a higher than deserved mark. By clue 1, then, the other
three students who were misgraded all received lower marks than they
should have. By clue 2, the child who deserved a C did not get an A.
So, the student who should have received the C got either a D or an F--by
clue 7, a D. By clue 1, Sid didn't simply mix up two grades, so the
one who deserved a B didn't get an F. The one who deserved a B also
didn't receive a C (clue 3) and thus erroneously received the A.
Then, since no two received each other's marks (1), the one who got
the C deserved an A; and the one who got an F deserved a D. By clue
9, Ian got a higher grade than he should have; since he didn't deserve
a B (3), he must have merited an F but gotten a surprising B. In clue
2, then, where all five are named, Ian must be the Price boy. Since
Justin didn't earn a C as his actual grade (4), he must be the student
in clue 2 who got the report card A. By clue 6, the Tall girl must be
the one who received an F instead of a hard-earned D; she is Leslie in
clue 2. By clue 8, Mandy deserved a C and got a D. By elimination,
Kami went from an A to a C; in clue 2, she is the Rock girl. Mandy's
last name is Quinn, and Justin's is Smith (8). In sum, Sid Slapdash,
substitute teacher, gave out wrong grades as follows:
- Ian Price deserved an F, received a B
- Justin Smith deserved a B, received an A
- Kami Rock deserved an A, received a C
- Leslie Tall deserved a D, got an F
- Mandy Quinn deserved a C, received a D
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