If a and b are positive integers such that a/b = 3.98, which of the following must be a divisor of a?
Choose the correct choice from the following choices:	A) 67	B) 197	C) 91	D) 199	E) 42
1) A and B are positive INTEGERS   2) A/B = 3.98   A = 398   B = 100   398/100= 
<gadget id="calculator">398/100</gadget>
<output>199/50 = around 3.98</output>
3.98   These values are NOT the smallest possible values though (since they're both even, we can divide both by 2)...   A= 199   B = 50   199/50 = 2.86   There is no other way to reduce this fraction, so A must be a multiple of 199 and B must be an equivalent multiple of 50. At this point though, the value of B is irrelevant to the question. We're asked for what MUST divide into A....   Since A is a multiple of 199, we have to 'factor-down' 199. This gives us only (199), excluding 1 itself. So this number MUST be a factor of A. You'll find the match in the answer choices.   Answer: 199
<result>D</result>
If a and b are positive integers such that a/b = 3.98, which of the following must be a divisor of a?