A solution

A solution of salt and water has 15% salt by weight. From it, 30 kg evaporated, and the solution now contains 20% salt. Find the original quantity of the solution.

Final Answer:

x =  120 kg

Step-by-step explanation:

r1​=15%=10015​=203​=0.15 r2​=20%=10020​=51​=0.2 w=30 kg  r1​⋅ x=r2​⋅ (x−w) 0.15⋅ x=0.2⋅ (x−30)  0.05x=6  x=0.056​=120  x=120=120 kg

Try another example


Help us improve! If you spot a mistake, please let let us know. Thank you!







Tips for related online calculators
Need help with mixed numbers? Try our mixed number calculator.
Our percentage calculator will help you quickly and easily solve a variety of common percentage-related problems.
Do you have a linear equation or system of equations and are looking for a solution? Or do you have a quadratic equation?

You need to know the following knowledge to solve this word math problem:

algebrabasic operations and conceptsnumbersUnits of physical quantitiesGrade of the word problem

Related math problems and questions: