John has a bag of marbles that contains 12 red marble, 20 green marbles, and 17 blue marbles. If john pulls one marble out of the bag what is the probility that will not be red

Add all of the numbers up (12+17+20=49)

R: 12/49

G: 17/49

B: 20/49

scense your only looking for how many of red marbles you are not getting you only have to divide 12 divided by 49 then multiply by 100 to get your percent

Answer: 24%