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**Of the three numbers, the first is twice the second and the second is twice the third. The average of the reciprocal of the numbers is $\frac{7}{72} .$ The numbers are: **

A. 36, 18, 9
B. 24, 12, 6
C. 20, 10, 5
D. 16, 8, 4

A. 36, 18, 9 B. 24, 12, 6 C. 20, 10, 5 D. 16, 8, 4