Rachel and her friends are making necklaces out of beads and straws. They plan to use 12 beads and 5 straws for each necklace. They have a jar of beads that contains a total of 2,700 beads. How many necklaces can they make?

Assuming they have limitless supply of straws (since you fail to mention whether that is a limiting criteria or not, like you did with the beads), then the answer is as simple as ...

2700/12 = 225

so the answer is 225 necklaces