Question

A bag has 3 green marbles and 12 red marbles what is the probability that is a red

Answer 1

There's a 4/5 chance of it being red aka a 80% chance

Explanation:

3 green and 12 red divide each by 3 making it 1 green and 4 red in total 5 and 100% divided by 5 equal 20 so there's a 20% chance of green and 80% chance of red

Or the more complicated

There is a 80% chance it will be red

3 green marbles, 12 red, in total 15 so when you divide 100% by 15 you get 6.666666666666667 and when times by the 3 green it is 20% and that means there is a 80% chance of red.