A certain drink of type A is prepared by mixing 4 parts milk with 3 parts fruit juice. Another drink of type B is prepared by mixing 4 parts of fruit juice and 3 parts of milk. How many liters of fruit juice must be added to 105 liters of drink A to convert it to drink B?	Choose the most appropriate option:	A) 14	B) 21	C) 28	D) 35	E) 42
In 105 liters of drink A, there are 60 liters of milk and 45 liters of juice.   With 60 liters of milk, we need a total of 80 liters of juice to make drink B.   We need to add 35 liters of juice.   The answer is 35.
<result>D</result>
A certain drink of type A is prepared by mixing 4 parts milk with 3 parts fruit juice. Another drink of type B is prepared by mixing 4 parts of fruit juice and 3 parts of milk. How many liters of fruit juice must be added to 105 liters of drink A to convert it to drink B?