Mister Maier, Mister Weber and Mister Smith work in a quarry on different shifts.
These are the early morning shift, the late shitf and the night shift.
Each worker is assigned a different task.
These are : extraction, preparation and sale of material.
In no specific order, these three workers earn 1500, 1600 and 1700 dollars.
We also know the following:
The worker of the late shift earns less than Mister Smith.
Mister Maier is assigned to the extraction of material.
The one who earns 1700 dollars, works a shift before the worker responsible for the preparation of material.
In the production sequence, the work done on the early shift comes before the work done by the worker who earns 1600 dollars.