If n is a positive integer and n^2 is divisible by 450, then what is the largest positive integer that must divide n?  Choose one:  A) 10  B) 20  C) 30  D) 40  E) 50
450 = 2 * 3^2 * 5^2   If 450 divides n^2, then n must be divisible by   2 * 3 * 5= 
<gadget id="calculator">  2 * 3 * 5</gadget>
<output>30</output>
30   The answer is 30.
<result>C</result>
If n is a positive integer and n^2 is divisible by 450, then what is the largest positive integer that must divide n?