11. Senai customized her bicycle by exchanging the front wheel for a wheel that had one half the diameter of the back wheel. Now when Senai rides the bicycle, how many revolutions does the front wheel make for each revolution of the back wheel?
(A) \[8\]
(B) \[4\]
(C) \[3\]
(D) \[\frac{1}{2}\]
(E) \[\frac{1}{4}\]

12. A list of numbers consists of \[p\] positive and \[n\] negative numbers. If a number is picked at random from this list, the probability that the number is positive is \[\frac{3}{5}\]. What is the value of \[\frac{n}{p}\]?
(A) \[\frac{3}{8}\]
(B) \[\frac{5}{8}\]
(C) \[\frac{2}{3}\]
(D) \[\frac{3}{2}\]
(E) \[\frac{8}{3}\]

13. The total daily cost \[c\], in dollars, of producing \[x\] units of a certain product is given bu the function \[c(x) = \frac{600x - 200}{x} + k\], where \[k\] is a constant and \[x \le 100\]. If \[20\] units were produced yesterday for a total cost of \[$640\], what is the value of \[k\]?
(A) 40
(B) 50
(C) 60
(D) 590
(E) 600

14. For how many ordered pairs of positive integers \[(x, y)\] is \[2x + 3y < 6\]?
(A) One
(B) Two
(C) Three
(D) Five
(E) Seven

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