To solve this problem you must apply the proccedure shown below:
1. Let's call to the number of equipment operators and
to the numbers of laborers.
2. Based on the information given in the problem above, you can make a system of equation, as following:
3. By applying the method of substitution, you can solve for from the second equation and substitute it into the first equation to solve for
, as following:
4. Now, substitute the value of into the second equation to calculate
:
The answer is: 19 equipment operators and 13 laborers.