Cook 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 Cook has in his herd?  Pick one:
A) 336	B) 180	C) 120	D) 456	E) 155
On first look A, D,E are not divisible either by 5 or 6 - ruled out.   C,B divisible by both 5,6, but 180 is divisible by 9.   Answer : 120
<result>C</result>
Cook 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 Cook has in his herd?