Hello. No, it is not. With a triangle, the sum of 2 lengths of any 2 sides will always be greater than the third side. In the problem 5 + 8 is 13, which is less than 15. So this cannot be a triangle.
If we have 156 beads and we can make one bracelet with 9 beads we divide 156 by 9 and get 17 1/3. since we cannot have 1/3 of a bracelet, we can make 17 bracelets.
