3.5 tsp = 3.5 x 4.93 ml = 17.255
ml              Â
( since each tsp = 4.93 ml)
now amount of dextromethorphan = [( w/v) % /( 100) ] x
volume of drug
                                  Â
= ( 0.4/100) x 17.255
                               Â
= 0.069 g
                     Â
= 0.069 x 1000 mg  = 69
mg            Â
( since each 1g = 1000 mg)
amount of guaifenisin = ( 1.2/100) x 17.255
                      Â
= 0.20706 g
                Â
= 0.20706 x 1000 = 207 mg
Thus 3.5 tsp of syrup has 69 mg of dextromethorphan and
207 mg of guainfenish
