A manufacturer company produces a standard model and deluxe model of 25”

TV. The standard model requires 12th of Labor to produce and the deluxe modal
requires 18th. The company has 360th of labor available per week. The plant's
capacity is a total of 25 sets per week. If all the available time and capacity are to be
used, how many of each type of set should be produced.

s+d = 25

12s+18d = 360
Now solve as usual

what unit of labor is "th" ?