The answer is like this!
the total number of marbles all together is 25, so that would be the denominator.
blue: 6/25- simplified= already in simplified form
red:10/25- simplified= 2/5
green:9/25- simplified= already in simplified form
so the answer to your question is 2/5.
hope this helped!!
Christy did not get enough because 12 times 8 = 96. she needs 4 for inches.