A bag of fertilizer is labeled, 15-20-10. this means that it contains 15% of Nitrogen, 20% of Phosphorus and 10% of Potassium by weight. How many kilograms of Nitrogen, Phosphorus and Potassium are in the bag?
To find out, you need to know how much kilograms there are in each ingredient.
15% of 30= 4.5 kg
20% of 30= 6 kg
10% of 30= 3 kg
4.5+6+3= 13.5 kg
There are 4.5kg of Nitrogen, 6kg of Phosphorus, and 3kg of potassium for a total of 13.5kg.