How many liters of a 40% iodine solution need to be mixed with 35 liters of a 20% iodine solution to create a 34% iodine solution?
Answers:
A) 35
B) 49
C) 100
D) 105
E) 136
Solution 1:   Assume the iodine solution to be mixed = x lts.   Iodine = 0.4x lts, Water = 0.6x lts.   Solution 2: 35 liters of a 20% iodine solution   Iodine = 7 lts, Water = 28 lts.   Total iodine = 0.4x + 7   Total water = 0.6x + 28   The resultant is a 35% idoine solution.   Hence (0.4x + 7) / (x + 35) = 34/100   40x + 700 = 34x + 1220   6x = 820   x = 136 lts   Correct Option: 136
<result>E</result>
How many liters of a 40% iodine solution need to be mixed with 35 liters of a 20% iodine solution to create a 34% iodine solution?