The positive integer x is a solution of the equation (x ÷ 12) ÷ (15 ÷ x) = 20. What is the sum of the digits of x?
A. 15 B. 12 C. 9 D. 6 E. 3
D
Rewriting and solving gives x = 60, and the sum of the digits of 60 is 6.
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