In what proportion must rice at Rs 3.10 per kg be mixed with rice at Rs 3.75 per kg, so that the mixture be worth Rs 3.25 a kg?  Choose one.
A) 7/3 B) 5/3 C) 10/3 D) 3/7 E) 11/5
10/3.P of 1 kg of cheaper rice = Rs 3.10   10/3.P of 1 kg of expensive rice = Rs 3.75   the mixture be worth for 1 kg = Rs 3.25   By the alligation rule : Quantity of cheaper rice / Quantity of expensive rice   = (3.75 - 3.25)/(3.25 - 3.10)   = (0.50)/(0.15)   = 10/3   10/3
<result>C</result>
In what proportion must rice at Rs 3.10 per kg be mixed with rice at Rs 3.75 per kg, so that the mixture be worth Rs 3.25 a kg?