Final answer:
Finlay will count back in steps of a half from 5.7 until he reaches or gets closest to zero.
Step-by-step explanation:
Finlay counts back in steps of a half from 5.7. Since he knows he will not land on zero, he will continue counting until he reaches the closest number before zero.
So, Finlay will count: 5.7, 5.2, 4.7, 4.2, 3.7, 3.2, 2.7, 2.2, 1.7, 1.2, 0.7.
Therefore, Finlay will have counted 11 numbers in total.