Write a system of inequalities that describes the possible solutions to the problem.The Pen-Ink Company manufactures two ballpoint pens: silver and gold. The silver requires 4 minutes in a grinder and 15 minutes in a bonder. The gold requires 5 minutes in a grinder and 8 minutes in a bonder. The grinder can be run no more than 680 minutes per day and the bonder no more than 220 minutes per day. Let x represent the number of silver pens, and let y represent the number of gold pens. Including the system inequalities 
and 
, find the remaining
inequalities that best represent this company's daily production of silver and gold pens.
A. x + y ? 680, x + y ? 220, x + y ? 900
B. 4x + 15y ? 680, 5x + 8y ? 220
C. 4x + 5y ? 680, 15x + 8y ? 220
D. 0 ? 19x + 13y ? 900
Answer: C
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