Stacey made a necklace using 4 times as many blue beads as red beads. She used a total of 40 beads. How many blue beads did Stacey use?
36
the anwser is 8
Let x = number of red beads.
x + 4x = 40
5x = 40
x = 8
x + 4x = 40
5x = 40
x = 8