The ratio of red marbles to blue marbles in a bag is 2 to 5. If there are 60 more blue marbles than red marbles in the bag, how many marbles are there all together?
Let's call the red and blue marbles 2x and 5x. We know that 5x = 2x + 60, so x = 20. The sum of all marbles in the bag is 2x + 5x = 7x which is 7 * 20 = 140 marbles. Hope this helps!
