2, A, 9, B, 6. C.13, D.?
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Answer:
a + c = 2b
2 + 9 =2A
A = 5.5
9 + 6 = 2B
B = 7.5
6 + 13 = 2C
C = 9.5
C + D = 2(13)
9.5 + D = 26
D = 16.5
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