Let P=Presentation, SD=Sleep Deprivation, UW=Unfinished Work, LB=Late Bedtime, S=Sleepy, PS = Problem Set due, L = going to Lecture, SIC = Sleeping In Class, A = Allergies, AS = Allergy Season (Spring), SUN = Stuffed Up Nose, SNIC = Snoring in Class, FB = Feeling Bad, NC = New class Content, DW = Dead Week, and NFSB = Not Feeling So Bad.

P + UW + PS = LB
LB + SD = S
PS = L
S + L = SIC
A + AS = SUN
SIC + SUN = SNIC
SNIC = FB
DW + NC + FB = NFSB

Got that? .... now what does the bus driver weigh?