There are 4 people of different heights standing in order of increasing height. The difference is 2 inches between the first person and the second person, and also between the second person and the third person. The difference between the third person and the fourth person is 6 inches and the average height is 79. How tall is the fourth person?  Choose the correct answer:
A) 85  B) 87  C) 89  D) 91  E) 93
Let x be the height of the first person.   Then the heights are x, x+2, x+4, and x+10.   4x+16 = 4(79) = 316   x = 75 and the fourth person has a height of 75+10= 
<gadget id="calculator">75+10</gadget>
<output>85</output>
85 inches   The answer is 85.
<result>A</result>
There are 4 people of different heights standing in order of increasing height. The difference is 2 inches between the first person and the second person, and also between the second person and the third person. The difference between the third person and the fourth person is 6 inches and the average height is 79. How tall is the fourth person?