books dealing with cleanliness,in english,hindi and sociology,have to be stacked in such a way that all books are stored topicwise and height of each stack is the same.the number of english books is 240,number of hindi books is 96 and the number of sociology books is 336. assuming that the books are of same thickness,find the number of stacks of each books? which mathematical concept is used in this problem? which good habit is discussed in this problem?