If x and y are positive integers such that x/y = 2.18, which of the following numbers could be y?  Choose the most appropriate option
A) 50
B) 5
C) 150
D) 2
E) 100
With the given information, we are trying to find the value of y.   To achieve this we must convert the given decimal to a fraction and reduce it to it's lowest integer form.   Take the decimal x/y = 2.18 and because it's in the hundreds decimal place, put the given value (x/y = 2.18/1) and multiply it by 100.   Take the resulting fraction (x/y = 218/100) and reduce it to it's lowest form.   Both of the numbers are divisible by 2.   The result is x/y = 109/50.   Thus y = 50.   The correct answer is 50.
<result>A</result>
If x and y are positive integers such that x/y = 2.18, which of the following numbers could be y?