Find the highest common factor of 36 and 84.
Answers:
A) 12	B) 10	C) 16	D) 19	E) 18

Rationale: "36 = 2 ^ 2 x 3 ^ 2 84 = 2 ^ 2 x 3 x 7 h . c . f . = 2 ^ 2 x 3 = 12 . answer : option a"
Answer: A