Question

the ratio of blue marbles to red marbles in a bag is 11:9. if there are 99 blue marbles in the bag how many marbles are red?

Answer 1

If there were 99 blue marbles there would be 81 red marbles.
$\frac{11}{9} \frac{*9}{*9}= \boxed{\frac{99\ red}{81\ blue}}$

Answer 2

99 blue 81 red marbles