What is the matter that can vary in composition

Mixtures

Explanation:

Mixtures are the matter which can vary in composition as mixtures are the combination of one or more substances combined together physically to form a new substance whose ratio can vary accordingly and is not fixed.

A mixture has two components i.e Solute and Solvent. The Solute is the substance which is taken in less amount in the solution and the Solvent is the substance which is present in greater amount in the solution. For example Sugar dissolve in water where water is a solvent in sugar is a solute.

Mixtures are if two types i.e Homogeneous mixture and Heterogeneous mixture. A Homogeneous mixture is that which has uniform composition properties throughout the solution, whereas, a Heterogeneous mixture is the mixture which do not have uniform composition properties throughout the solution.

The correct answer is 15%.

Explanation:

In a bag of fertilizer, the letters NPK is written, which signifies nitrogen content, phosphorus content, and potassium content in sequential order. These are the three nutrients that form a complete fertilizer. The content of the nutrients is denoted by numbers, which is followed by a percentage symbol as these numbers signify the percentage of the nutrient in the formation of the fertilizer. Thus, 30-15-10 shows that the given fertilizer comprises 30 percent nitrogen, 15 percent phosphorus, and 10 percent potassium.