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