27. Kirsten wrote numbers in 5 of the 10 circles as shown in the figure. She wants to write
a number in each of the remaining 5 circles such that the sums of the 3 numbers along
each side of the pentagon are equal. Which number will she have to write in the circle
marked by
隙?
(A) 7 (B) 8 (C) 11 (D) 13 (E) 15
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