A bag contains 7 red marbles and 5 black marbles. You want to add 60 marbles to the bag, but the ratio of red to black marbles must remain the same. How many of each color should you add?

Step-by-step explanation:

divide 60 in the ratio 7:5

red=7/12 * 60=35

black=5/12 * 60=25

Answer: you would add 35 red marbles and 25 black marbles

Step-by-step explanation:

A bag contains 7 red marbles and 5 black marbles. This means that the ratio of the number of red marbles to the number of black marbles is

7 : 5

You want to add 60 marbles to the bag, but the ratio of red to black marbles must remain the same. This means that the proportion or factor would remain constant

7/5 = 1.4

It means that for each black marble added, 1.4 red marble will be added. Therefore

If we add 25 black marbles, the red marbles would be 25 * 1.4 = 35