Chemistry
posted by CC .
200. g of a solvent is available, how many grams of a solute should be weighed out to make a 15.0% solution by mass?

What's the definition of mass percent?
% = (mass solute/100 g solution)*100.
mass solute = x
mass solution = 200 g solvent + x g solute = 200+x
Substitute and solve for x.
(x/x+200)*100 = 15
x=?? 
still not making sense because answers are
a. 30.0
b. 35.3
c. 15.0
d. 28.9 
Then you made a math error because the correct answer is listed.