Question

A bag contains 18 red marbles. The ratio of red marbles to blue marbles is 6 to 9. Find the number of blue marbles in the bag.

Answer 1

The ratio tells us that every 6 red marbels there are 9 blue marbels. We have 6 * 3 red marbels, so we'll have 9 * 3 blue marbels, or 27 blue marbels