A mixture contains 4 fluid ounces of water for every 3 fluid ounces of blue food coloring How much blue food coloring needs to be added to 12 fluid ounces of water?
Answer: Let x be the amount of blue food coloring to be added to 12 fluid ounces of water.
Therefore, we have:




Therefore, 9 ounces of blue food coloring needs to be added to 12 fluid ounces of water.