42573y is exactly divisible by 72, then what is the minimum value of y? Pick:
A) 3  B) 4  C) 6  D) 8  E) 9
72 = 9 x8, where 9 and 8 are co-prime.   The minimum value of x for which 73x for which 73x is divisible by 8 is, x = 6.   Sum of digits in 425736 = (4 + 2 + 5 + 7 + 3 + 6)= 
<gadget id="calculator">(4 + 2 + 5 + 7 + 3 + 6)</gadget>
<output>27</output>
27, which is divisible by 9.   Required value of y is 6   6
<result>C</result>
42573y is exactly divisible by 72, then what is the minimum value of y?