Can someone solve a system of inequalities?

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

Can someone me out here and the tell me the greatest common factor

One of every 20 customers reports poor customer service on your company’s customer satisfaction survey. you have just created a new process that should cut the number of poor customer service complaints in half. what percentage of customers would you expect to report poor service after this process is implemented? 1.) 5% 2.) 10% 3.) 2% 4.) 2.5%