If the average of 4, 5, 6 and P is 7, what is the value of P?

A 8
B 12
C 15
D 13

Correct Answer: 13

4 + 5 + 6 + p = <math xmlns = "http://www.w3.org/1998/Math/MathML"><mn>4</mn><mo>&#xD7;</mo><mn>7</mn></math><math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x21D2;</mo></math> p = 20 - 4 - 5 - 6<math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x2234;</mo></math> p = 13
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