A patient is given exactly 750 milliliters of a mixture of two medications daily. Medication A contains 40% pain killer and medication B contains 20% pain killer. If the patient receives exactly 215 milliliters of pain killer daily, how many milliliters of medication B are in the mixture? Choose the most appropriate option:
A) 150
B) 225
C) 325
D) 425
E) 550
Let there be A milliliters of Medication A   and B milliliters of Medication B   A+B = 750 -- 1   Medication A contains 40% pain killer and medication B contains 20% pain killer.   (40/100)*A + (20/100)*B = 215   =&gt; (2/5)*A + (1/5)*B = 215   Multiplying by 5 , we get   2A + B = 1075 -- 2   Equation 2- Equation 1 , we get   A = 325   B = 425   Answer 425
<result>D</result>
A patient is given exactly 750 milliliters of a mixture of two medications daily. Medication A contains 40% pain killer and medication B contains 20% pain killer. If the patient receives exactly 215 milliliters of pain killer daily, how many milliliters of medication B are in the mixture?