Vanessa, Mike and Sarah have missed a total of 17 days of school this year. Vanessa and Mike have missed 14 days total, and Mike and Sarah have missed 12 days total. How many days of school did Vanessa miss alone?
Choose the correct choice from the following
A) 9
B) 4
C) 5
D) 2
E) 3
Vanessa + Mike + Sarah = 17   V+M=14   M+S=12 &lt;&lt;Use this formula &amp; plug into the original formula, to get Vanessa's total   V + (M + S) = 17   V + 12 = 17   Subtract 12 from both sides   V = 5   Answer: 5
<result>C</result>
Vanessa, Mike and Sarah have missed a total of 17 days of school this year. Vanessa and Mike have missed 14 days total, and Mike and Sarah have missed 12 days total. How many days of school did Vanessa miss alone?