Answer: Noemi strings together 6 green beads at $0.75 each to make the bracelet.
Step-by-step explanation:Let's start by using algebra to solve the problem. We can begin by letting x be the number of green beads that Noemi strings together. Then, the cost of the green beads will be 0.75x, and the cost of the blue beads will be 3 × 0.30 = 0.90.
The total cost of the bracelet will be the sum of the cost of the green and blue beads, which is 0.75x + 0.90. The total number of beads on the bracelet will be x + 3.
We know that the average cost per bead is $0.60. We can write this as:
(0.75x + 0.90)/(x + 3) = 0.60
Now we can solve for x:
0.75x + 0.90 = 0.60(x + 3)
0.75x + 0.90 = 0.60x + 1.80
0.15x = 0.90
x = 6
Therefore, Noemi strings together 6 green beads at $0.75 each to make the bracelet.