If you have 200 mL of a 60% sodium chloride solution,

Question

how much NaCl is dissolved in the solution?

Answer 1

60% by mass means 60 g NaCl per 100 ml of solution. Since you have 200 mls solution, that would mean 120 g of NaCl was dissolved.

60 g/100 ml x 200 ml = 120 g