Deepsea is 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 colour. What is the probability of it being a blue marble?
Answer
Zero!
Deepsea only has 5 red marbles.
