Write a report to the president of the company explaining the meaning of the solutions.

Answer:

The negative part of the solution is ignored because a negative number of phones cannot be produced. The company must assemble at least 25 more phones that work to reach an 80% success rate. It has 3 working phones out of the 10 already made, so if the next 25 phones work, 28 of 35 phones will work, bringing the company to its goal of 80% on the 35th phone.