When positive integer x is divided by positive integer y, the remainder is 7. If x/y = 86.1, what is the value of y? Answers
A) 72 B) 71 C) 70 D) 30 E) 45

Rationale: "when positive integer x is divided by positive integer y , the remainder is 7 - - > x = qy + 7 ; x / y = 86.1 - - > x = 86 y + 0.1 y ( so q above equals to 86 ) ; 0.1 y = 7 - - > y = 70 . answer : c ."
Answer: C