In what ratio mental A at Rs.68 per kg be mixed with another metal at Rs.96 per kg so that cost of alloy (mixture) is Rs.78 per kg?
Options:
A) 5:8  B) 4:7  C) 3:7  D) 9:5  E) 9:8
(96-78)/(78-68)=18/10=9/5   ANSWER:9:5
<result>D</result>
In what ratio mental A at Rs.68 per kg be mixed with another metal at Rs.96 per kg so that cost of alloy (mixture) is Rs.78 per kg?