300
It is the linear system from the word problem:
There are 20 workers employed on a highwat project, some at $210 per day and somw at $160 per day. The daily payroll is $2550. Let x represent the number of $210 workers per day and y represents the $160 per day. Solve the linear system to find the workers at each pay rate.
What is x + y = 20 and 210x + 160y = 2550