A 20% solution of salt weighing 80 g was added 10% solution weighing 60 g. Find the mass fraction

A 20% solution of salt weighing 80 g was added 10% solution weighing 60 g. Find the mass fraction of the solute in the resulting solution.

first, let’s find out how much salt was in the solutions:
20% salt in 80g. To find how much it is in grams, 80×20 / 100 = 16gr.
10% salt in 60g. 60×10 / 100 = 6gr.
Now you need the percentage of the mixture. First, we find out the mass of the solution (add all the components) and salt
Solution: 80 + 60 = 140gr.
Salts: 16 + 6 = 22
Then everything is simple: divide the salt by the solution and multiply by 100%:
22 / 140×100 = 2200/140 = 220/14 = 110/7 approximately 15.7%
Answer: 15.7%