Efficiency is a measure of how ?

The efficiency of the mathematical formula r = P / C often measures the ratio of useful performance to total input, where P represents the amount of useful output ("product") produced according to the amounts of C ("cost") of the used resources.

Explanation:

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.