< b="" />Explanation:< />

The mixed media filter consists of three components: coal, sand, and garnet. The ratio in which these components are present determines the efficiency and effectiveness of the filter. The correct ratio is given as 6:3:1.

< b="" />Coal:< /> Coal is one of the components of the mixed media filter. It is primarily responsible for the removal of organic matter and contaminants from the water. It acts as an adsorbent and absorbs impurities, thereby improving the water quality. In the given ratio, coal is present in a ratio of 6.

< b="" />Sand:< /> Sand is another component of the mixed media filter. It acts as a filtration medium and helps in the removal of suspended solids and larger particles from the water. Sand provides physical filtration and enhances the overall efficiency of the filter. In the given ratio, sand is present in a ratio of 3.

< b="" />Garnet:< /> Garnet is the third component of the mixed media filter. It is a high-density material that helps in the removal of smaller particles and sediment from the water. Garnet provides fine filtration and improves the clarity and quality of the filtered water. In the given ratio, garnet is present in a ratio of 1.

< b="" />Ratio:< /> The ratio of coal, sand, and garnet in the mixed media filter is given as 6:3:1. This means that for every 6 units of coal, there are 3 units of sand and 1 unit of garnet. This ratio ensures an optimal combination of adsorption, physical filtration, and fine filtration, resulting in effective water treatment.

< b="" />Conclusion:< /> The correct ratio in which coal, sand, and garnet are present in the mixed media filter is 6:3:1. This ratio ensures efficient removal of impurities, suspended solids, and sediments, resulting in high-quality filtered water.