Three move fractions show crosstalk as a directed count transfer between lanes. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
One tenth of lane a moves to lane b
Lane a starts with 60 counts. Moving 1/10 sends 6 counts to lane b, giving output 54 and 46.
60⋅101=6
One fifth of lane a moves twelve counts
With the same source ledger, move fraction 1/5 moves 12 counts, so the output is 48 in lane a and 52 in lane b.
60⋅51=12
One third of lane a moves twenty counts
A larger move fraction 1/3 sends 20 counts to lane b, ending at 40 and 60.