conc. of adrug is 7.5 mg in teaspoonful what will be conc. in 150 ml

conc. of adrug is 7.5 mg in teaspoonful what will be conc. in 150 ml:
7.5 mg________ 5ml
x? mg________ 150 ml
ْْْْْx mg=7.5x150/5 =225 mg