Question

You make a necklace using blue, purple, and green beads in a ration of 1:1:2. You use the total of 168 beads. How many green beads in the necklace?

Answer 1

Let

# of blue beads = x
# of purple beads = x
# of green beads = 2x

The total number of beads = x + x + 2x = 168
So 4x = 168 means x = 42 and there are
2x = 2× 42 = 84 green beads