On dividing 199 by a number, the quotient is 11 and the remainder is 1. Find the divisor.
Choose one:  A) 12  B) 14  C) 16  D) 18  E) 22

Rationale: "d = ( d - r ) / q = ( 199 - 1 ) / 11 = 198 / 11 = 18 d )"
Answer: D