Number 1, Jamal has 28 CDs, 1/4 are rock, 1/2 are R&B, and 1/4 are jazz. Since one half are R&B, and half of 28 is 14, 14 of the triangle things will be R&B. Since one fourth of the CDs are rock, and one fourth of 28 is 7, seven of the triangles will be rock. And since one fourth are jazz, and, once again, one fourth of 28 is seven, 7 of the triangles will be jazz. Hope this helps a little.