If you look at a group of five people, three are black and two are white, then 22 ÷ 5 = 4...2, so there are four groups with 2, so the second one from the left is black beads, so all 22 beads are black. And 45÷5=9, divisible, so it is the last one in the 1 group, that is, the white bead, so all 45 beads are white.