All data you have from the author's sentence is the first year, none about the following ones, then the conclusion that none last the full five years. But you assumed it's 1/5th per year, every year.
Anyway, it doesn't matter much either way, even if there's a few that survive, they will be having wear and tear to the point you wouldn't want another student to have them (or maybe as a replacement for a broken one); you wouldn't want some year 1 students to get a new ones while others get the year 4/5 leftovers, they'll resent it for sure.
Anyway, it doesn't matter much either way, even if there's a few that survive, they will be having wear and tear to the point you wouldn't want another student to have them (or maybe as a replacement for a broken one); you wouldn't want some year 1 students to get a new ones while others get the year 4/5 leftovers, they'll resent it for sure.
Second, they'll be paid off after a few years.