A chemical supply company has 60 liters of a 45% HNO3 solution. How many liters of pure undiluted HNO3 must the chemists add so that the resultant solution is a 50% solution?  Choose the correct choice from the following answers:	A) 6	B) 15	C) 20	D) 24	E) 30
60 liters of a 45% HNO3 solution means HNO3 = 27 liters in 60 liters of the solution.   Now, let x be the pure HNO3 added.   As per question,   27 + x = 50% of (60 + x)   or x =6. Hence, 6
<result>A</result>
A chemical supply company has 60 liters of a 45% HNO3 solution. How many liters of pure undiluted HNO3 must the chemists add so that the resultant solution is a 50% solution?