In what ratio must tea of Rs.42 per kg be mixed with tea of Rs.50 per kg so that cost of mixture is Rs.45 per kg?  Answers:
A) 5 : 3
B) 3 : 5
C) 2 : 3
D) 3 : 4
E) 1 : 2

Rationale: 50 - 45 : 45 - 42 = 5 : 3 answer : a
Answer: A