Answer :
Solution = solute + solvent (generally water)
% (m/v): mass of solute diluted in 100 mL of solution
We have here 355 mL of 5.50 %(m/v) solution.
To find the mass of glucose, we proceed like this:
5.50 %(m/v): 5.50 g of glucose ----- 100 mL of solution
So,
5.50 g of glucose ------- 100 mL of solution
x -------- 355 mL of solution
x = 355 mL x 5.50 g / 100 mL
x = 19.5 g of glucose = answer