A type of mixture is prepared by mixing brand at Rs.9 a kg with brand B at Rs.4 a kg.If a mixtue is worth rupees 7 a kg,how many kgs of brand A are needed to make 40 kgs of the mixture?	Pick one: A) 21 B) 22 C) 23 D) 24 E) 25
9 4   7   (7-4) 3 2 (9-7)   thus ratio would be 3:2   and thus 3x+2x=40   so x=8 and 3x=24.   thus A type of mixture would be of 24 kg.   ANSWER:24
<result>D</result>
A type of mixture is prepared by mixing brand at Rs.9 a kg with brand B at Rs.4 a kg.If a mixtue is worth rupees 7 a kg,how many kgs of brand A are needed to make 40 kgs of the mixture?