Mary can divide his herd into 5 equal parts and also to 6 equal parts, but not to 9 equal parts. What could be the number of cows Mary has in his herd?	Choose the correct option.
A) 120  B) 155  C) 456  D) 180  E) 336
On first look B,C,E are not divisible either by 5 or 6 - ruled out.   D,A divisible by both 5,6, but 180 is divisible by 9.   120nswer : 120
<result>A</result>
Mary can divide his herd into 5 equal parts and also to 6 equal parts, but not to 9 equal parts. What could be the number of cows Mary has in his herd?