James eats cookies every day. The first day, he eats 2 cookies. He eats 4 more cookies each day after that. What is the average number of cookies he eats per day for the first 2 weeks?  Answers:
A) 32.14  B) 45  C) 49.28  D) 30  E) 33.33
2 weeks = 14 days   Total cookies = 2 + 6 + 10 + ... + (2 + 14(4))   =2 + 6 + 10 + ... + 58   =2(1 + 3 + 5 + ... + 29)   =2(1 + 2 + 3 + ... + 29 - (2 + 4 + ... + 28))   =2 (1 + 2 + ... + 29) - 2(2 + 4 + ... + 28)   =2(1 + 2 + ... + 29) - 2(2)(1 + 2 + ... + 14)   =2(29)(30)/2 - 4(14)(15)/2   =870-420= 
<gadget id="calculator">870-420</gadget>
<output>450</output>
450   32.14verage= 450/14   =32.14   Option 32.14
<result>A</result>
James eats cookies every day. The first day, he eats 2 cookies. He eats 4 more cookies each day after that. What is the average number of cookies he eats per day for the first 2 weeks?