a certain type of candy is sold in small boxes of 8 and large boxes of 15. notice it would be impossible to buy exactly 12 candies without breaking up a box. it would also be impossible to buy 17 candies without breaking up a box. what is the greatest number of candies that it would be impossible to buy without breaking up a box...please answer and explain step by step how u got it!

Your question doesn't make any sense to me.

The greatest number of candies it would be impossible to buy????