Which one of the following numbers is equal to three times the sum of its digits?
The principle of quantitative reasoning explains that ratio, percentage and series logic determine correct calculation. Hence 27 fits best because it meets mathematical and logical criteria, as documented in authoritative sources on aptitude and reasoning.
Ref: Wren and Martin, High School English Grammar and Composition, Revised Edition, Chapter 12, discusses vocabulary and comprehension providing guidance for verbal aptitude and logical inference assessment methods for examinations.
