So i just wanna see if i got this one correct my question each volume of an encyclopedia is 2 1/3 inches wide. how many volumes will fit on a shelf 18 inches wide?

Namely how many times does 2 and 1/3 go into 18, well, is just the quotient of both,

let's first convert the mixed fraction to "improper" and then do the division



of course, you won't be chopping off a volume, so only the whole number will go from the quotient.