Brain Teasers
Missing Marbles
Deepsea was walking to her computer when she lost her marbles. They fell out of the bag and rolled under the couch.
Deepsea has 3 times as many green marbles as blue marbles, and 5 more red marbles than green marbles. The total number of marbles is the number of red marbles plus 4 times the number of green marbles.
Deepsea reaches her hand under the couch. She pulls something out. She knows it's a marble but doesn't know what color. What is the probability of it being a blue marble?
Deepsea has 3 times as many green marbles as blue marbles, and 5 more red marbles than green marbles. The total number of marbles is the number of red marbles plus 4 times the number of green marbles.
Deepsea reaches her hand under the couch. She pulls something out. She knows it's a marble but doesn't know what color. What is the probability of it being a blue marble?
Hint
It's lower than the chances of it being a red marble.Answer
Zero!Deepsea only has 5 red marbles.
Hide Hint Show Hint Hide Answer Show Answer
What Next?
View a Similar Brain Teaser...
If you become a registered user you can vote on this brain teaser, keep track of which ones you have seen, and even make your own.
Solve a Puzzle
Comments hidden to avoid spoilers.
Follow Braingle!