A bike left these tracks on the mud:
Which way did the bicycle go?
Credits and source attribution
James Tanton, Solve This: Math Activities for Students and Clubs, page 21
madematics
Making Math
A bike left these tracks on the mud:
Which way did the bicycle go?
Credits and source attribution
James Tanton, Solve This: Math Activities for Students and Clubs, page 21
madematics 
Very confident — Thick track from rear wheel; thin track from front wheel
Less confident — bike was ridden right to left
(Neglected to indicate if bike was being pedaled forwards or backwards; though it doesn’t matter so long as you are a good enough rider to pedal a non-freewheeling bike backwards 🙂