Answer :
he would need to add 36 non blue marbles to the bag.
[tex] \frac{4}{40}= \frac{1}{10} [/tex] this is true because when you can divide 4 into the top and bottom evenly giving you this equivalent.
[tex] \frac{4}{40}= \frac{1}{10} [/tex] this is true because when you can divide 4 into the top and bottom evenly giving you this equivalent.