In what ratio should two varieties of sugar of Rs.18 per kg and Rs.24 kg be mixed together to get a mixture whose cost is Rs.20 per kg?  Choose the correct choice from the following answers:
A) 1:3  B) 3:1  C) 1:2  D) 2:1  E) 3:4
Explanation:   =4:2=2:1   ANSWER IS 2:1
<result>D</result>
In what ratio should two varieties of sugar of Rs.18 per kg and Rs.24 kg be mixed together to get a mixture whose cost is Rs.20 per kg?